A batch droplet generating device with ultrasonic precision control

Abstract

A device for generating droplets in batches with ultrasonic precision control relates to the field of droplet generation technology. An ultrasonic atomizer is installed at the center of the liquid surface in a liquid storage tank through a shock-absorbing support rod, and is connected to a control circuit for vibration to convert the liquid phase into a gas phase. A guide plate is installed in the notch of the liquid storage tank, and multiple booster nozzles are arranged. The middle layer of the droplet receiving plate is a cavity and a negative pressure pump is installed. The lower layer is arranged in an array and connected to the cavity. Multiple droplet adsorption holes are arranged in an array, and the upper layer is evenly embedded with multiple condensers. The material transfer mechanism can transport the droplet receiving plate, and multiple droplet grooves are arranged in an array on the surface of the droplet receiving platform. Based on the ultrasonic atomizer, the liquid is sprayed out in the form of a spray, and the condensation effect of the droplet receiving plate is used to achieve the generation and collection of high-quality droplets. The droplets are transported to the droplet receiving platform by transportation, which can achieve batch generation of droplets and greatly improve the generation efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of droplet generation, in particular to an ultrasonic precision-controlled batch droplet generating device. Background Art

[0002] Traditional droplet generators are used in industrial production and laboratory research on chemical reactions because of their simple structure, especially droplet generators with dropping funnels. The mechanism of this droplet generation technology mainly uses strict control of the pressure in the funnel, and controls the droplet generation rate under the condition of controlling the pressure. Droplet funnels are divided into spherical, pear-shaped and cylindrical shapes according to their shapes. Droplet funnels of different shapes are used in different industries and fields as needed.

[0003] With the continuous development of science and technology and the continuous expansion of application fields, the requirements for droplet generation devices are also constantly increasing. At present, the technical optimization of droplet generation devices is mainly concentrated on the changes in shape, size and structure. The rare technical optimization is to add a layer of super-hydrophobic coating in the droplet funnel to reduce the droplets from sticking to the needle of the funnel due to viscosity. For example: The Chinese invention authorization patent with patent announcement number CN114904455A discloses a linear controllable precision single droplet generation device, which uses micron-level molybdenum wire or other wires of similar level as replacement steel wires, and directly replaces and pushes out tiny droplets by servo-feeding equal volume of replacement steel wires to obtain single droplets separated by droplets; the Chinese utility model patent application with announcement number CN213876314U discloses a molten droplet generation device for EUV light source, which is provided with a heat transfer oil inlet and a heat transfer oil outlet on the outer wall of the body, and uses the heating chamber to transmit the heat transfer medium, and the electric heating rod maintains the overall experimental temperature environment of the melting device, and the high-speed nozzle sprays out experimental metal droplets as required.

[0004] However, the efficiency of droplet generation in traditional funnel-shaped droplet generators is low, especially for liquids with high viscosity, which can only generate one or a few droplets each time. At the same time, droplets often stick to the needle at the outlet due to the effect of viscosity, which reduces the quality and efficiency of droplet generation. Therefore, there is an urgent need for a droplet generator that can effectively guarantee the generation quality and generate droplets in batches to meet the technical requirements for droplet generation in various fields at this stage. Summary of the invention

[0005] In order to address the shortcomings of the background technology, the present invention provides an ultrasonic precision-controlled batch droplet generating device, which sprays liquid in the form of spray based on an ultrasonic atomizer, utilizes the condensation effect of a droplet receiving plate to achieve the generation and collection of high-quality droplets, and transports them to a droplet receiving platform, thereby achieving batch generation of droplets and greatly improving the generation efficiency.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an ultrasonic precision-controlled batch droplet generating device, comprising a liquid storage tank, an ultrasonic atomizing sheet, a droplet receiving plate, a material transfer mechanism and a droplet receiving platform, wherein the liquid required for the droplets to be generated is stored in the liquid storage tank, the ultrasonic atomizing sheet is installed at the center of the liquid surface in the liquid storage tank through a shock-absorbing support rod, the ultrasonic atomizing sheet is connected to a control circuit to vibrate to convert the liquid on the liquid surface from a liquid phase to a gas phase, a guide plate is installed in the slot of the liquid storage tank above the ultrasonic atomizing sheet, and a guide plate is arranged in the middle of the guide plate Multiple booster nozzles, the initial position of the droplet receiving plate is located above the guide plate, the droplet receiving plate is divided into a three-layer structure of upper, middle and lower layers, the middle layer is set as a cavity and a negative pressure pump is installed to provide negative pressure, the lower layer is arranged in an array with multiple droplet adsorption holes and connected to the cavity, the upper layer is evenly embedded with multiple condensation tubes, the material transfer mechanism can transfer the droplet receiving plate between the initial position and directly above the droplet receiving platform, the surface of the droplet receiving platform is arranged in an array with multiple droplet grooves, and the multiple droplet grooves are arranged one-to-one with the multiple droplet adsorption holes.

[0007] Furthermore, the shock-absorbing support rod includes a sleeve, a telescopic rod and a spring. The sleeve is vertically fixed to the bottom surface of the liquid storage tank, the telescopic rod is slidably inserted in the top of the sleeve, and a connecting ear is arranged on the top of the telescopic rod. The connecting ear is hinged with a pin shaft, and the pin shaft is transversely fixed between two connecting plates preset at the bottom of the ultrasonic atomizer sheet. The spring is sleeved on the outside of the telescopic rod and supported between the connecting ear and the top surface of the sleeve.

[0008] Furthermore, a slide groove is provided in the middle of the bottom of the ultrasonic atomizer and a counterweight is slidably installed, two pull ropes are fixed at both ends of the moving direction of the counterweight, and the free ends of the two pull ropes extend out through the through holes opened at the corresponding positions of the side wall of the liquid storage tank and are sealed.

[0009] Furthermore, the droplet receiving platform has a built-in weight measuring instrument powered by a second power source.

[0010] Furthermore, the control circuit of the ultrasonic atomizer sheet includes a power supply 1, a switch, a sliding rheostat and an ammeter connected in series therewith.

[0011] Furthermore, the droplet adsorption hole is a conical hole and a super-hydrophobic coating is provided on the inner wall thereof.

[0012] Furthermore, the material transfer mechanism adopts a screw motor with a guide rod, a connecting frame is fixed at the center position of the upper surface of the droplet receiving plate, the connecting frame is provided with a threaded hole and a guide hole, the screw part of the screw motor is screwed together with the threaded hole, and the guide rod is slidingly matched with the guide hole.

[0013] Furthermore, a liquid inlet is arranged at the bottom of the side wall of the liquid storage tank to provide liquid required for generating droplets to the interior by pumping.

[0014] Furthermore, the plurality of droplet grooves on the surface of the droplet receiving platform are connected to a negative pressure system or a hydrophilic material layer is provided on the inner wall.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention abandons the traditional form of droplet generation that relies on increasing the pressure through a needle, and instead adopts the mutual transformation of the liquid phase and the gas phase, and sprays the liquid in the form of a spray based on an ultrasonic atomizer, and the booster nozzle of the guide plate acts on the droplet receiving plate after being pressurized, and utilizes the condensation effect of the droplet receiving plate combined with the negative pressure to achieve the generation and collection of high-quality droplets, which are then transported to the droplet receiving platform through a material transfer mechanism, and the negative pressure is cut off to achieve a one-to-one transfer of droplets from the droplet receiving plate to the droplet receiving platform under its own weight, which can generate multiple droplets at a time to achieve batch generation of droplets, greatly improving the droplet generation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the batch droplet generating device of the present invention;

[0017] Figure 2 It is a schematic structural diagram of the shock absorbing support rod in the present invention;

[0018] Figure 3 It is a structural schematic diagram of the guide plate in the present invention;

[0019] Figure 4 It is a schematic structural diagram of the droplet receiving plate in the present invention.

[0020] In the figure: 1. liquid storage tank; 1-1. liquid inlet; 2. ultrasonic atomizer; 3. shock-absorbing support rod; 3-1. sleeve; 3-2. telescopic rod; 3-3. connecting ear; 3-4. spring; 3-5. pin; 4. guide plate; 4-1. boost nozzle; 5. power supply 1; 6. switch; 7. sliding rheostat; 8. ammeter; 9. droplet receiving plate; 9-1. droplet adsorption hole; 9-2. cavity; 9-3. condenser; 9-4. negative pressure pump; 10. material transfer mechanism; 11. droplet receiving platform; 11-1. droplet tank; 12. power supply 2; 13. weight measuring instrument; 14. counterweight; 15. pull rope. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] like Figure 1 to Figure 4 As shown, an ultrasonic precision-controlled batch droplet generating device comprises a liquid storage tank 1, an ultrasonic atomizing sheet 2, a guide plate 4, a droplet receiving plate 9, a material transfer mechanism 10 and a droplet receiving platform 11.

[0023] Combination Figure 1 As shown, the liquid storage tank 1 is used to store the liquid required for the droplets to be generated. A liquid inlet 1-1 can be arranged at the bottom of the side wall of the liquid storage tank 1 to provide the liquid required for the droplets to be generated to the inside by pumping according to the required flow rate, thereby ensuring that the ultrasonic atomization sheet 2 is always in contact with the liquid surface.

[0024] Combination Figure 1 , Figure 2As shown, the ultrasonic atomizer sheet 2 is installed at the center of the liquid surface in the liquid storage tank 1 through a shock-absorbing support rod 3. The ultrasonic atomizer sheet 2 is connected to the control circuit to vibrate to convert the liquid on the liquid surface from a liquid phase to a gas phase. The control circuit can be in the form of an ultrasonic atomizer sheet 2 connected in series with a power supply 5, a switch 6, a sliding rheostat 7 and an ammeter 8. The control circuit is powered by the power supply 5, the control circuit is connected and disconnected by the switch 6, the ultrasonic atomizer sheet 2 is vibrated with different amplitudes by changing the current size through the sliding rheostat 7, and the current value of the control circuit is displayed by the ammeter 8. Since the ultrasonic atomizer sheet 2 generates vibrations during operation, the shock-absorbing support rod 3 is required to have certain vibration-allowing conditions. Specifically, the shock-absorbing support rod 3 can be composed of a sleeve 3-1, a telescopic rod 3-2 and a spring 3-4. The sleeve 3-1 is vertically fixed to the inner bottom surface of the liquid storage tank 1, and the telescopic rod 3-2 is slidably inserted into the top end of the sleeve 3-1. A connecting ear 3-3 is arranged at the top end of the telescopic rod 3-2. The connecting ear 3-3 is hingedly matched with a pin 3-5. The pin 3-5 is transversely fixed between two connecting plates preset at the bottom of the ultrasonic atomizer sheet 2. The spring 3-4 is sleeved on the outside of the telescopic rod 3-2 and supported between the connecting ear 3-3 and the top end surface of the sleeve 3-1. In addition, in order to facilitate the adjustment of the inclination angle of the ultrasonic atomizer sheet 2 so that its direction can be adjusted to adapt to gas phase generation in different ranges, a slide groove can be set in the middle of the bottom of the ultrasonic atomizer sheet 2 and a counterweight block 14 can be slidably installed. Two pull ropes 15 are fixed at both ends of the moving direction of the counterweight block 14. The free ends of the two pull ropes 15 are respectively extended through the through holes opened at the corresponding positions of the side wall of the liquid storage tank 1 and are sealed to prevent liquid leakage. Such a design can change the position of the counterweight block 14 in the slide groove at the bottom of the ultrasonic atomizer sheet 2 through the two pull ropes 15, so that it is centered on the pin shaft 3-5, and the inclination angle of the ultrasonic atomizer sheet 2 is changed by the same (the counterweight block 14 slides to the center position) or different (the counterweight block 14 slides to the side) load on both sides to achieve adjustment in different directions.

[0025] Combination Figure 1 , Figure 3 As shown, the guide plate 4 is installed in the groove of the liquid storage tank 1 and is located above the ultrasonic atomization sheet 2. A plurality of booster nozzles 4-1 are arranged in the middle of the guide plate 4 to convert the liquid into gas phase and then spray it to the droplet receiving plate 9 above through the booster nozzles 4-1. To ensure the boosting effect, the edge of the guide plate 4 and the liquid storage tank 1 should be sealed.

[0026] Combination Figure 1 , Figure 4As shown, the initial position of the droplet receiving plate 9 is located above the guide plate 4 for receiving the gas phase converted from the liquid ejected by the boost nozzle 4-1. The droplet receiving plate 9 is divided into an upper, middle and lower three-layer structure. The middle layer is set as a cavity 9-2 and a negative pressure pump 9-4 is installed to provide negative pressure. The lower layer is arranged in an array with multiple droplet adsorption holes 9-1 and connected to the cavity 9-2. It is advisable to use conical holes and set a super-hydrophobic coating (such as fluorinated polyethylene and polyvinyl fluoride) on the inner wall to prevent the droplets from sticking to the droplet adsorption holes 9-1 due to viscosity. The upper layer is evenly embedded with multiple condensation tubes 9-3, and the gas phase is converted back to liquid phase droplets through the condensation effect of the multiple condensation tubes 9-3, and the liquid phase droplets are adsorbed on the droplet adsorption holes 9-1 under the negative pressure of the cavity 9-2. In addition, the droplet adsorption holes 9-1 can be designed to be of different sizes to achieve differential control of the droplet size.

[0027] Combination Figure 1 As shown, the material transfer mechanism 10 can transfer the droplet receiving plate 9 between the initial position and directly above the droplet receiving platform 11. For example, a common screw motor is used in combination with a guide rod. A connecting frame is fixed at the center position of the upper surface of the droplet receiving plate 9. The connecting frame is provided with a threaded hole and a guide hole. The screw part of the screw motor is screwed together with the threaded hole, and the guide rod is slidably matched with the guide hole. In this way, when the screw motor drives the screw to rotate forward and reverse, the left and right movement of the droplet receiving plate 9 can be achieved under the cooperation between the screw and the threaded hole and the direction restriction of the guide rod.

[0028] Combination Figure 1 As shown, the surface of the droplet receiving platform 11 is arrayed with a plurality of droplet grooves 11-1, and the plurality of droplet grooves 11-1 are arranged one-to-one with the plurality of droplet adsorption holes 9-1. When the material transfer mechanism 10 moves the droplet receiving plate 9 to the top of the droplet receiving platform 11, the droplet adsorption holes 9-1 of the droplet receiving plate 9 correspond one-to-one with the droplet grooves 11-1 on the surface of the droplet receiving platform 11. After the negative pressure pump 9-4 is turned off, the droplets can be separated from the droplet adsorption holes 9-1 under the action of gravity and fall into the corresponding droplet grooves 11-1. In order to prevent the dripping droplets from splashing after entering the droplet grooves 11-1, the plurality of droplet grooves 11-1 can be connected to a negative pressure system or a hydrophilic material layer can be set on the inner wall. In addition, a weight measuring instrument 13 powered by a second power supply 12 can be built into the droplet receiving platform 11. If the droplet adsorption holes 9-1 adopt the same configuration size so that the adsorbed droplets are of the same size, the total weight of the droplets falling into the droplet receiving platform 11 is weighed by the weight measuring instrument 13, and then the number of droplets in the droplet tank 11-1 is observed. The mass of a single droplet generated can be obtained by dividing the total weight by the number, thereby achieving rapid and accurate measurement of the droplet size.

[0029] When in use, the ultrasonic atomizer sheet 2 is started through the control circuit to spray the liquid in the liquid storage tank 1 in the form of gas phase, and then pressurized by the booster nozzle 4-1 arranged on the guide plate 4 and shot to the droplet receiving plate 9. Under the condensation action of the condenser 9-3, the gas phase is transformed into liquid droplets, and adsorbed on the corresponding droplet adsorption holes 9-1 under the action of negative pressure. After the droplet receiving plate 9 is transferred to the top of the droplet receiving platform 11 through the material transfer mechanism 10, the negative pressure pump 9-4 is turned off to stop the negative pressure action, and the droplets fall into the droplet groove 11-1 at the corresponding position of the droplet receiving platform 11 under gravity. During this period, the position of the counterweight block 14 can be changed by two pull ropes 15 to realize the direction adjustment of the ultrasonic atomizer sheet 2, so that the gas phase can act on the bottom of the droplet receiving plate 9 in a larger range.

[0030] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other forms of assembly without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0031] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An ultrasonic precision-controlled batch droplet generating device, characterized in that: The invention comprises a liquid storage tank (1), an ultrasonic atomizing sheet (2), a droplet receiving plate (9), a material transfer mechanism (10) and a droplet receiving platform (11), wherein the liquid storage tank (1) stores liquid required for generating droplets, the ultrasonic atomizing sheet (2) is installed at the center of the liquid surface in the liquid storage tank (1) through a shock-absorbing support rod (3), the ultrasonic atomizing sheet (2) is connected to a control circuit to vibrate so as to convert the liquid on the liquid surface from a liquid phase to a gas phase, a guide plate (4) is installed in the slot of the liquid storage tank (1) above the ultrasonic atomizing sheet (2), a plurality of boosting nozzles (4-1) are arranged in the middle of the guide plate (4), and the initial position of the droplet receiving plate (9) is located above the guide plate (4), the droplet receiving plate (9) is divided into an upper, middle and lower three-layer structure, the middle layer is set as a cavity (9-2) and is equipped with a negative pressure pump (9-4) to provide negative pressure, the lower layer is arranged in an array with a plurality of droplet adsorption holes (9-1) and is connected to the cavity (9-2), the upper layer is evenly embedded with a plurality of condensation tubes (9-3), the material transfer mechanism (10) can transfer the droplet receiving plate (9) between the initial position and directly above the droplet receiving platform (11), the surface of the droplet receiving platform (11) is arranged in an array with a plurality of droplet grooves (11-1), and the plurality of droplet grooves (11-1) are arranged one-to-one with the plurality of droplet adsorption holes (9-1).

2. The ultrasonic precision-controlled batch droplet generating device according to claim 1, characterized in that: The shock-absorbing support rod (3) includes a sleeve (3-1), a telescopic rod (3-2) and a spring (3-4); the sleeve (3-1) is vertically fixed on the inner bottom surface of the liquid storage tank (1); the telescopic rod (3-2) is slidably inserted into the top of the sleeve (3-1); a connecting ear (3-3) is arranged at the top of the telescopic rod (3-2); the connecting ear (3-3) is hingedly matched with a pin (3-5); the pin (3-5) is transversely fixed between two connecting plates preset at the bottom of the ultrasonic atomizer (2); the spring (3-4) is sleeved on the outside of the telescopic rod (3-2) and supported between the connecting ear (3-3) and the top surface of the sleeve (3-1).

3. The ultrasonic precision-controlled batch droplet generating device according to claim 2, characterized in that: A slide groove is arranged in the middle of the bottom of the ultrasonic atomizing sheet (2) and a counterweight block (14) is slidably installed thereon. Two pull ropes (15) are fixed at both ends of the moving direction of the counterweight block (14). The free ends of the two pull ropes (15) extend out through holes respectively provided at corresponding positions of the side wall of the liquid storage tank (1) and are sealed.

4. The ultrasonic precision-controlled batch droplet generating device according to claim 1 or 3, characterized in that: The droplet receiving platform (11) has a built-in weight measuring instrument (13) powered by a second power source (12).

5. The ultrasonic precision-controlled batch droplet generating device according to claim 1, characterized in that: The control circuit of the ultrasonic atomizing sheet (2) comprises a power source (5), a switch (6), a sliding rheostat (7) and an ammeter (8) connected in series therewith.

6. The ultrasonic precision-controlled batch droplet generating device according to claim 1, characterized in that: The droplet adsorption hole (9-1) is a conical hole and a super-hydrophobic coating is provided on the inner wall thereof.

7. The ultrasonic precision-controlled batch droplet generating device according to claim 1, characterized in that: The material transfer mechanism (10) adopts a screw motor with a guide rod, a connecting frame is fixed at the center position of the upper surface of the droplet receiving plate (9), the connecting frame is provided with a threaded hole and a guide hole, the screw part of the screw motor is screwed to the threaded hole, and the guide rod is slidably engaged with the guide hole.

8. The ultrasonic precision-controlled batch droplet generating device according to claim 1, characterized in that: The bottom of the side wall of the liquid storage tank (1) is connected to a liquid inlet (1-1) for supplying liquid required for generating droplets to the interior by means of pumping.

9. The ultrasonic precision-controlled batch droplet generating device according to claim 1, characterized in that: The plurality of liquid drop grooves (11-1) on the surface of the liquid drop receiving platform (11) are connected to a negative pressure system or a hydrophilic material layer is provided on the inner wall.

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