CN108704685A - A kind of asynchronous drop generating system of polydispersion - Google Patents
A kind of asynchronous drop generating system of polydispersion Download PDFInfo
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- 238000001802 infusion Methods 0.000 claims abstract description 73
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Abstract
一种多分散异步液滴发生系统，包括异步液滴发生器、供液装置及外部驱动装置；异步液滴发生器包括液滴发生组件：包括管路连接器、输液管组件及压电晶体，输液管组件包括至少两个输液管，每个输液管的外侧壁上固定有压电晶体；管路连接器的下开口端设有密封垫片，密封垫片上设有与输液管数量相同的固定插孔，输液管插接于密封垫片上；绝缘外壳包括柱状空腔体及上金属板和下金属板；管路连接器、导线连接器插接固定于上金属板上；压电晶体分别通过导线经导线连接器与外部驱动装置相连；输液管的端部通过输液管通孔到达绝缘外壳的外部。本发明通过预设频率、流体流量、压力等参数，可产生液滴尺寸均匀、稳定的高频异步多分散液滴。
A polydisperse asynchronous droplet generation system, including an asynchronous droplet generator, a liquid supply device and an external drive device; the asynchronous droplet generator includes a droplet generation component: including a pipeline connector, an infusion tube assembly and a piezoelectric crystal, The infusion tube assembly includes at least two infusion tubes, and piezoelectric crystals are fixed on the outer wall of each infusion tube; the lower opening end of the pipeline connector is provided with a sealing gasket, and the sealing gasket is provided with the same number of infusion tubes. Fixed socket, the infusion tube is plugged on the sealing gasket; the insulating shell includes a columnar cavity, an upper metal plate and a lower metal plate; the pipeline connector and the wire connector are plugged and fixed on the upper metal plate; piezoelectric crystal The wires are respectively connected to the external driving device through the wire connector; the end of the infusion tube reaches the outside of the insulating shell through the through hole of the infusion tube. The invention can generate high-frequency asynchronous polydisperse droplets with uniform and stable droplet size through preset frequency, fluid flow, pressure and other parameters.
Description
技术领域technical field
本发明涉及一种多液滴撞击实验系统，尤其是一种多分散异步液滴发生系统。The invention relates to a multi-droplet impact experiment system, in particular to a polydisperse asynchronous droplet generating system.
背景技术Background technique
液滴撞击现象属于典型的自由表面流动问题，广泛存在于自然界、农业和工程技术中，对其深入研究有赖于模拟仿真和实物测试，目前在液滴撞击领域梁刚涛、魏兰、余欢、贾晓娟等做了大量的液滴撞击模拟仿真以及单液滴撞击实验，但鲜有关于多液滴的撞击研究尤其是实验研究，大多都是以模拟为主。究其原因，主要是多液滴撞击实验对实验关键设备-液滴发生器要求较高。现有的液滴发生系统适用于单液滴撞击实验，但对多液滴发生设备的研制仍处于起步阶段。很多学者在做喷雾实验时所使用的多液滴发生装置均为自行改装而成，其结构复杂，体积大，制造成本高，且其液滴发生频率可控性较差，无法产生均匀的多分散液滴，无法生成异步多分散液滴阵列。在国内也有部分关于单液滴分散的专利技术，但鲜有同步或异步多液滴发生装置的相关记载。The phenomenon of droplet impact is a typical free surface flow problem, which widely exists in nature, agriculture and engineering technology. Its in-depth study depends on simulation and physical testing. Currently, Liang Gangtao, Wei Lan, Yu Huan, Jia Xiaojuan have done a lot of droplet impact simulations and single droplet impact experiments, but there are few studies on multi-droplet impact, especially experimental studies, most of which are based on simulation. The reason is mainly that the multi-droplet impact experiment has high requirements on the key experimental equipment-droplet generator. Existing droplet generation systems are suitable for single droplet impact experiments, but the development of multi-droplet generation devices is still in its infancy. The multi-droplet generating devices used by many scholars in spray experiments are self-modified, with complex structures, large volumes, high manufacturing costs, and poor controllability of the droplet generation frequency, which cannot generate uniform multi-droplets. Scattered droplets, unable to generate asynchronous polydisperse droplet arrays. There are also some patented technologies on single droplet dispersion in China, but there are few relevant records on synchronous or asynchronous multi-droplet generating devices.
发明内容Contents of the invention
本发明的目的是提供一种结构简单、体积小、可实现异步多分散液滴阵列的多分散异步液滴发生系统。The object of the present invention is to provide a polydisperse asynchronous droplet generating system with simple structure, small volume and the ability to realize asynchronous polydisperse droplet arrays.
本发明解决现有技术问题所采用的技术方案：一种多分散异步液滴发生系统，包括异步液滴发生器、供液装置及外部驱动装置；所述异步液滴发生器包括绝缘外壳及安装于绝缘外壳中的液滴发生组件；该液滴发生组件包括管路连接器、输液管组件及压电晶体，输液管组件包括至少两个输液管，每个输液管的外侧壁上固定有压电晶体；管路连接器的下开口端覆盖并固定有密封垫片，密封垫片上设有与输液管数量相同的固定插孔，所述输液管通过该固定插孔插接固定于密封垫片上，并使输液管与管路连接器相连通； 绝缘外壳包括包裹于液滴发生组件外侧且两端开放的柱状空腔体及位于两开放端的上金属板和下金属板；管路连接器、导线连接器插接固定于上金属板上，管路连接器的上开口端与供液装置相连；所述压电晶体分别通过导线经导线连接器与外部驱动装置相连；下金属板上设有与所述输液管的端部相配适的输液管通孔，以使输液管的端部通过输液管通孔到达绝缘外壳的外部。The technical solution adopted by the present invention to solve the existing technical problems: a polydisperse asynchronous droplet generating system, including an asynchronous droplet generator, a liquid supply device and an external drive device; the asynchronous droplet generator includes an insulating shell and an installation A droplet generating assembly in an insulating housing; the droplet generating assembly includes a pipeline connector, an infusion tube assembly and a piezoelectric crystal, and the infusion tube assembly includes at least two infusion tubes, each of which is fixed with a pressure on the outer wall of the infusion tube Transistor; the lower opening end of the pipeline connector is covered and fixed with a sealing gasket, and the sealing gasket is provided with the same number of fixed sockets as the infusion tubes, and the infusion tubes are plugged and fixed on the sealing gasket through the fixed sockets The infusion tube is connected to the pipeline connector; the insulating shell includes a columnar cavity wrapped on the outside of the droplet generating component with open ends and an upper metal plate and a lower metal plate at the two open ends; the pipeline connection The connector and wire connector are plugged 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 the external driving device through wires through the wire connector; the lower metal plate An infusion tube through hole matching the end of the infusion tube is provided, so that the end of the infusion tube reaches the outside of the insulating shell through the infusion tube through hole.
所述输液管组件外侧套接有弹性套管，并使弹性套管位于管路连接器的下开口端。The outer side of the infusion tube assembly is sleeved with an elastic sleeve, and the elastic sleeve is located at the lower open end of the pipeline connector.
所述柱状空腔体的内侧壁上设有导线通道，该导线通道与所述导线连接器相连通，每个输液管上的压电晶体通过分别通过导线经该导线通道及导线连接器与外部驱动装置相连。The inner side wall of the columnar hollow body is provided with a wire channel, which communicates with the wire connector, and the piezoelectric crystal on each infusion tube passes through the wire channel and the wire connector to communicate with the outside through the wire channel and the wire connector respectively. The drive unit is connected.
所述外部驱动装置的数量与输液管的数量相配适，以使每个输液管上的压电晶体与一个外部驱动装置相连。The quantity of the external driving device is adapted to the quantity of the infusion tube, so that the piezoelectric crystal on each infusion tube is connected with one external driving device.
供液装置包括注液泵，注液泵依次通过过滤器、阀门及压力表与所述管路连接器的上开口端相连。The liquid supply device includes a liquid injection pump, and the liquid injection pump is connected with the upper open end of the pipeline connector through a filter, a valve and a pressure gauge in sequence.
所述外部驱动装置为函数发生器。The external driving device is a function generator.
所述柱状空腔体为ABS柱状空腔体，该柱状空腔体为两个半圆柱外壳拼接而成的圆柱状壳体。The columnar cavity body is an ABS columnar cavity body, and the columnar cavity body is a cylindrical shell formed by splicing two semi-cylindrical shells.
本发明的有益效果在于：本发明结构简单，其主要由异步液滴发生器及与异步液滴发生器配合连接的注液泵、过滤器、阀门、压力表及函数发生器组成，其中异步液滴发生器作为整个系统的主要组成部分，其在结构上采用在管路连接器的端部固定多根输液管，并在每根输液管的外侧壁上设置一压电晶体，通过对输液管组件中输液管上的压电晶体分别施加不同的震动频率从而使输液管组件产生异步液滴的效果。本发明通过预设频率、流体流量、压力等参数，可产生不同分布、不同频率、不同速度、不同直径的液滴，液滴尺寸均匀、稳定。产生的高频异步多分散液滴可满足液滴撞击研究中高速摄像机的拍摄需要。The beneficial effect of the present invention is that: the present invention is simple in structure, and it is mainly composed of asynchronous droplet generator and an injection pump, filter, valve, pressure gauge and function generator that are connected with the asynchronous droplet generator, wherein the asynchronous droplet generator As the main component of the whole system, the drip generator is structurally fixed with a plurality of infusion tubes at the end of the pipeline connector, and a piezoelectric crystal is arranged on the outer wall of each infusion tube. The piezoelectric crystals on the infusion tube in the assembly apply different vibration frequencies to make the infusion tube assembly produce the effect of asynchronous droplets. The present invention can generate liquid droplets with different distributions, different frequencies, different speeds, and different diameters through preset frequency, fluid flow, pressure and other parameters, and the droplet size is uniform and stable. The generated high-frequency asynchronous polydisperse droplets can meet the shooting needs of high-speed cameras in droplet impact research.
附图说明Description of drawings
图1是本发明的系统结构示意图。Fig. 1 is a schematic diagram of the system structure of the present invention.
图2是本发明中异步液滴发生器的结构示意图。Fig. 2 is a schematic structural diagram of the asynchronous droplet generator in the present invention.
图3是本发明中液滴发生组件的结构示意图。Fig. 3 is a schematic structural view of the droplet generating assembly in the present invention.
图4是图2的俯视图。FIG. 4 is a top view of FIG. 2 .
图5是本发明中输液管的结构示意图。Fig. 5 is a schematic structural view of the infusion tube in the present invention.
图中：1-异步液滴发生器、2-注液泵、3-过滤器、4-阀门、5-压力表、6-函数发生器、7-绝缘外壳、8-输液管组件、9-管路连接器、10-压电晶体、11-输液管、12-输液管固定端、13-密封垫片、14-橡胶套管、15-上金属板、16-下金属板、17-导线连接器、18-导线通道、19-导线。In the figure: 1-Asynchronous droplet generator, 2-Infusion pump, 3-Filter, 4-Valve, 5-Pressure gauge, 6-Function generator, 7-Insulation shell, 8-Infusion tube assembly, 9- Pipeline connector, 10-piezoelectric crystal, 11-infusion tube, 12-fixed end of infusion tube, 13-sealing gasket, 14-rubber sleeve, 15-upper metal plate, 16-lower metal plate, 17-wire Connector, 18-wire channel, 19-wire.
具体实施方式Detailed ways
以下结合附图及具体实施方式对本发明进行说明：The present invention is described below in conjunction with accompanying drawing and specific embodiment:
图1是本发明一种多分散异步液滴发生系统的系统结构示意图。一种多分散异步液滴发生系统，包括异步液滴发生器1、供液装置及外部驱动装置，其中供液装置具体为注液泵2，注液泵2依次通过过滤器3、阀门4及压力表5与本发明的异步液滴发生器1中的管路连接器9的上开口端相连；外部驱动装置具体为函数发生器6。函数发生器6用于与本发明的异步液滴发生器1中的导线连接器17相连。Figure 1 is a schematic diagram of the system structure of a polydisperse asynchronous droplet generating system of the present invention. A polydisperse asynchronous droplet generating system, including an asynchronous droplet generator 1, a liquid supply device and an external drive device, wherein the liquid supply device is specifically a liquid injection pump 2, and the liquid injection pump 2 passes through a filter 3, a valve 4 and The pressure gauge 5 is connected to the upper open end of the pipeline connector 9 in the asynchronous droplet generator 1 of the present invention; the external driving device is specifically the function generator 6 . The function generator 6 is used to connect with the wire connector 17 in the asynchronous droplet generator 1 of the present invention.
图2为异步液滴发生器的结构示意图。本发明中的异步液滴发生器1包括绝缘外壳7及安装于绝缘外壳7中的液滴发生组件。图3示出了液滴发生组件的具体结构：该液滴发生组件包括管路连接器9、输液管组件8及压电晶体10。其中，输液管组件8包括至少两个输液管11，每个输液管11的外侧壁上可采用银基导电环氧树脂固定有压电晶体10（如图5所示），其中，压电晶体10可以采用方形或环形压电晶体；管路连接器9的下开口端设有输液管固定端12，在输液管固定端12内设有密封垫片13，并使该密封垫片13覆盖并固定于管路连接器9的下开口端，密封垫片13上设有与输液管11数量相同的固定插孔，输液管11通过该固定插孔插接固定于密封垫片13上，并使每个输液管11与管路连接器9相连通，密封垫片13的设计可以达到很好的密封效果，有效避免供液时，液体沿输液管11的外侧壁流出；为加固输液管组件8，在输液管组件8外侧套接有橡胶套管14，并使橡胶套管14位于管路连接器9的下开口端。Figure 2 is a schematic diagram of the structure of the asynchronous droplet generator. The asynchronous droplet generator 1 in the present invention includes an insulating housing 7 and a droplet generating component installed in the insulating housing 7 . FIG. 3 shows the specific structure of the droplet generating assembly: the droplet generating assembly includes a pipeline connector 9 , an infusion tube assembly 8 and a piezoelectric crystal 10 . Among them, the infusion tube assembly 8 includes at least two infusion tubes 11, and the outer wall of each infusion tube 11 can be fixed with a piezoelectric crystal 10 (as shown in FIG. 5 ) by using silver-based conductive epoxy resin, wherein the piezoelectric crystal 10 can adopt square or annular piezoelectric crystal; The lower open end of pipeline connector 9 is provided with transfusion tube fixed end 12, is provided with sealing gasket 13 in the transfusion tube fixed end 12, and makes this sealing gasket 13 cover and It is fixed on the lower opening end of the pipeline connector 9, and the sealing gasket 13 is provided with the same number of fixed sockets as the infusion tube 11, and the infusion tube 11 is plugged and fixed on the sealing gasket 13 through the fixed sockets, and the Each infusion tube 11 is connected with the pipeline connector 9, and the design of the sealing gasket 13 can achieve a good sealing effect, effectively preventing the liquid from flowing out along the outer side wall of the infusion tube 11 when the liquid is supplied; for strengthening the infusion tube assembly 8 A rubber sleeve 14 is sleeved on the outside of the infusion tube assembly 8 , and the rubber sleeve 14 is located at the lower open end of the pipeline connector 9 .
绝缘外壳7包括包裹于液滴发生组件外侧且两端开放的柱状空腔体及位于柱状空腔体两开放端的上金属板15和下金属板16。其中，柱状空腔体具体为为ABS柱状空腔体，如图2所示，该柱状空腔体为两个半圆柱外壳拼接而成的圆柱状壳体。如图4所示，液滴发生组件中的管路连接器9通过螺纹连接的方式插接固定于上金属板15上，以使管路连接器9的上开口端与供液装置相连；上金属板15上同样通过螺纹连接的方式插接固定有与柱状空腔体相连通的导线连接器17，为最大程度的保护线路损坏并保证走线的齐整性，优选在柱状空腔体的内侧壁上设有导线通道18，导线通道18与导线连接器17相连通，每个输液管11上的压电晶体10通过分别通过导线19经该导线通道18及导线连接器17与函数发生器6相连，具体地，函数发生器6的数量与输液管11的数量相配适，每个输液管11上的压电晶体10与对应的一个函数发生器6相连，以控制每个输液管11上的压电晶体10可在产生不同频率的周期性机械振动，以实现异步液滴的效果。下金属板16上设有与输液管11的端部相配适的输液管通孔，以使输液管11的端部通过输液管通孔到达绝缘外壳7的外部。The insulating shell 7 includes a columnar hollow body wrapped on the outside of the droplet generating assembly with both ends open, and an upper metal plate 15 and a lower metal plate 16 located at the two open ends of the columnar cavity body. Wherein, the columnar cavity body is specifically an ABS columnar cavity body. As shown in FIG. 2 , the columnar cavity body is a cylindrical shell formed by splicing two semi-cylindrical shells. As shown in Figure 4, the pipeline connector 9 in the droplet generating assembly is plugged and fixed on the upper metal plate 15 by threaded connection, so that the upper open end of the pipeline connector 9 is connected with the liquid supply device; The wire connector 17 connected to the columnar cavity is also plugged and fixed on the metal plate 15 by threaded connection. In order to protect the line from damage to the greatest extent and ensure the orderliness of the wiring, it is preferably on the inner side of the columnar cavity. The wall is provided with a wire channel 18, the wire channel 18 communicates with the wire connector 17, and the piezoelectric crystal 10 on each infusion tube 11 passes through the wire 19 respectively through the wire channel 18 and the wire connector 17 and the function generator 6 Specifically, the number of function generators 6 matches the number of infusion tubes 11, and the piezoelectric crystal 10 on each infusion tube 11 is connected with a corresponding function generator 6 to control the The piezoelectric crystal 10 can generate periodic mechanical vibrations of different frequencies to achieve the effect of asynchronous droplets. The lower metal plate 16 is provided with an infusion tube through hole matching with the end of the infusion tube 11, so that the end of the infusion tube 11 reaches the outside of the insulating shell 7 through the infusion tube through hole.
本发明的动作原理如下：注液泵2中的液体在泵动力作用下被挤出，如图1所示，以此经过滤器3、阀门4进入到异步液滴发生器1的输液管11中，与此同时函数发生器6产生电信号，诱导各个输液管11上的压电晶体10产生不同频率的周期性机械振动，经输液管11传递给管内液体，以使每个输液管11中液体从管内喷出后，在瑞利不稳定性作用下破碎成均匀的液滴,由于几个液管分别由不同频率的压电晶体10控制,所以能产生异步液滴。其中，液滴的阵列数由输液管11的数量决定；根据实际情况，可以在如果在输液管11的端部覆盖一层孔板,这时，液滴的阵列数由孔板的孔数决定，液滴大小与输液管11管径或者孔板孔径、流体种类有关，因此可通过更换不同管径的输液管11或者不同孔数、孔径的孔板来改变所要生成的液滴尺寸及阵列数。从而实现异步液滴的效果。The action principle of the present invention is as follows: the liquid in the injection pump 2 is squeezed out under the power of the pump, as shown in Figure 1, and enters the infusion tube 11 of the asynchronous droplet generator 1 through the filter 3 and the valve 4 At the same time, the function generator 6 generates electrical signals to induce the piezoelectric crystals 10 on each infusion tube 11 to produce periodic mechanical vibrations of different frequencies, which are transmitted to the liquid in the tube through the infusion tube 11, so that the liquid in each infusion tube 11 After being ejected from the tube, it is broken into uniform droplets under the action of Rayleigh instability. Since several liquid tubes are respectively controlled by piezoelectric crystals 10 of different frequencies, asynchronous droplets can be generated. Wherein, the number of arrays of droplets is determined by the number of infusion tubes 11; according to the actual situation, if the end of the infusion tube 11 is covered with a layer of orifice plate, at this time, the number of arrays of droplets is determined by the number of holes of the orifice plate , the size of the droplet is related to the diameter of the infusion tube 11 or the aperture of the orifice plate, and the type of fluid, so the size of the droplet to be generated and the number of arrays can be changed by replacing the infusion tube 11 with a different diameter or an orifice plate with a different number of holes and apertures. . Thereby achieving the effect of asynchronous droplets.
以上内容是结合具体的优选技术方案对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干简单推演或替换，都应当视为属于本发明的保护范围。The above content is a further detailed description of the present invention in combination with specific preferred technical solutions, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deduction or replacement can be made, which should be regarded as belonging to the protection scope of the present invention.
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