CN215203467U - Stacking forming device based on nano fluid droplet solidification - Google Patents
Stacking forming device based on nano fluid droplet solidification Download PDFInfo
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- CN215203467U CN215203467U CN202023267287.4U CN202023267287U CN215203467U CN 215203467 U CN215203467 U CN 215203467U CN 202023267287 U CN202023267287 U CN 202023267287U CN 215203467 U CN215203467 U CN 215203467U
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Abstract
The utility model relates to a pile up forming device based on nanometer fluid liquid drop solidifies, including injection unit and cryostage, the cryostage includes cooling back installation and locates the bearing bottom plate on the cooling back installation, the cooling back installation inner loop lets in the coolant liquid working medium, makes bearing bottom plate is in the low temperature state. The characteristic deformation of the nano fluid liquid drop in the solidification process is utilized to generate a platform structure on the top of the solidified liquid drop, and a cylindrical or tower-shaped structure with a large height-diameter ratio is prepared by one-step forming according to the stacking principle. The stacking structure of the nano fluid droplets is stable and controllable, and the accuracy is higher. The utility model discloses the liquid drop solidifies top surface and forms the platform, is convenient for continue the accurate liquid drop that piles up above that, solidifies the back at the nanometer fluid liquid drop, and its top surface is smooth, and the shape can be controlled, reduces to pile up the porosity after solidifying, is applicable to metal and polymer base three-dimensional printing and soldering tin technology.
Description
Technical Field
The utility model relates to a liquid drop solidifies the shaping field, concretely relates to piles up forming device based on nanometer fluid liquid drop solidifies.
Background
Nanofluids generally refer to liquids that suspend nanometer-scale solid particles, and are small, lightweight, and thermally conductive. The method is widely applied to the fields of energy, chemical industry and materials. When a traditional three-dimensional printing technology is used for processing linear parts, the structure is fragile due to material limitation, the structure cannot be maintained for a long time, and the traditional three-dimensional printing technology cannot be used in an industrial process. Or when the columnar structures are stacked, the surface is also rough. The use of conventional droplets for coagulation stacking suffers from the following limitations: 1) the single liquid drop is spherical under the influence of surface tension, and is also single spherical after solidification under the condition of not increasing external conditions. 2) The liquid drops are continuously dripped on the surface of the spherical solidified liquid drops, the supercooling degree is enough, the dripping position cannot be accurately determined if the liquid drops cannot roll, and gaps are generated even after solidification, so that the mechanical strength and the air tightness of the material are influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the above problems and providing a stacking and forming device based on the solidification of nanometer fluid liquid drops.
The purpose of the utility model is realized through the following technical scheme:
the utility model provides a pile up forming device based on solidification of nanometer fluid liquid drop, is including the injection unit that is used for dropwise add the liquid drop and be used for the low-temperature platform that the liquid drop solidifies, the low-temperature platform is including the circulative cooling device who is equipped with refrigeration working medium entry and refrigeration working medium export, and locate the last load-bearing bottom plate of circulative cooling device, the circulative cooling device inner loop lets in the coolant working medium, makes the load-bearing bottom plate is in the low temperature state.
The method is characterized in that a low-temperature platform is adopted to provide enough supercooling degree, nanometer fluid droplets dripped on a bearing bottom plate drop by drop through an injection unit are pushed from the bottom surface to the top surface of the droplets, after the nanometer fluid droplets are completely solidified, nanometer particles move along with compensating flow and are densely accumulated to the top surface to form a smooth platform, a platform structure is generated at the top of the solidified droplets by utilizing characteristic deformation in the solidification process of the nanometer fluid droplets, and a cylindrical or tower-shaped structure with a large height-diameter ratio is prepared by one-step molding according to the stacking principle.
Preferably, the bearing bottom plate is made of heat conducting materials, the heat conducting materials which are good in chemical stability and not prone to corrosion or oxidation are adopted, such as smooth copper sheets, and the heat conducting materials are fixed to the top of the circulating cooling device through heat conducting glue.
Preferably, the bearing bottom plate is connected with a temperature controller, the temperature is controlled by the temperature controller, and the working temperature of the low-temperature platform is set according to the freezing point of the selected nano-fluid suspension.
Preferably, the working medium of the cooling liquid circularly introduced into the circulating cooling device is an ethylene glycol aqueous solution with the mass concentration of 40%.
Preferably, the injection unit comprises an injector, preferably the injector is a thermostatic injector.
A stacking forming method based on nano fluid droplet solidification is carried out by adopting the stacking forming device, and comprises the following steps:
(1) preparing a nanofluid suspension;
(2) the injection unit sucks nano fluid, the nano fluid is dripped on a bearing bottom plate with a set supercooling degree drop by drop, a solidification surface is pushed from the bottom to the top of the liquid drop, and after the nano fluid is completely solidified, nano particles move along with compensation flow and are densely accumulated to the top surface to form a smooth platform;
(3) after the former liquid drop is solidified, the liquid drop is continuously placed in the right center of the platform to form a second cylinder or a circular table, and the steps are repeated to stack the cylinders.
Preferably, the injection unit is connected to the movement control device and cooperates with a computer program to change the placement position of the liquid drop, thereby realizing the three-dimensional printing function. Theoretically, the scheme can be used for printing micron-to-submicron-scale complex devices through one-step forming.
Preferably, the nanofluid suspension comprises a base liquid including water, a polymer or a liquid metal, and the nanoparticles are coated with a polymerCu and Al2O3Or TiO2The particle size of the nano particles is at least three orders of magnitude smaller than the size of the liquid drops, and the diameter of the liquid drops is 1-4 mm.
Theoretically, the smaller the particle size of the nanoparticles, the better, the oversized particles are detrimental to heat transfer exchange and can also form agglomerates, resulting in accelerated settling, and the particle size needs to be at least three orders of magnitude smaller than the droplet size. If the diameter of the liquid drop is 3mm, the particle size is selected to be less than 3 μm.
Preferably, the plateau formation time of the nano-fluid suspension droplets after solidification under super-cooling conditions varies from 0.1 to 100 seconds, depending on the droplet size.
The cylinder needs to accurately place liquid drops to the central symmetrical position of the front liquid drop forming platform; objects in the micrometer to submicron scale are solidified stacks of nanofluidic droplets that require sufficiently small droplet sizes and are uniformly stable.
The utility model discloses the theory of operation is based on the platform structure that the nanometer fluid liquid drop solidifies the back and forms, utilizes and piles up technology dropwise, and column or turriform structure that one shot forming preparation height and diameter ratio greatly. The realization device mainly comprises stable nanometer fluid, a bearing bottom plate, a circulating cooling device, a constant temperature injector and a temperature controller. The stable nanofluid is a uniform dispersion system prepared by a two-step method, and is dripped on the bearing bottom plate by a constant temperature injector. The temperature of the bearing bottom plate is controlled by the temperature controller, so that the bearing bottom plate has good heat-conducting property, stable chemical property and difficult oxidation. The liquid drop stacking process is carried out on the bearing bottom plate, the whole body is placed on the circulating cooling device, and the liquid drop stacking process is directly contacted with the circulating cooling device through the heat conducting glue.
The conventional pure liquid drop stacking has the defects of poor structural stability and high porosity due to the limited actual contact surface of point connection, and the stacking structure of the nano fluid liquid drops is stable and controllable, so that the accuracy is higher. It is different to pile up with conventional liquid drop solidification, the utility model discloses there are two advantages: first, the solidified top surface of the droplet forms a platform that facilitates accurate stacking of the droplet thereon. Second, after the nanofluid droplets solidify, their top surfaces are smooth and their shapes can be controlled, reducing the porosity of the solidified stacks, suitable for metal and polymer-based three-dimensional printing and soldering processes.
Compared with the prior art, the utility model discloses specific beneficial effect does:
1. by utilizing the mechanism that a platform structure is formed at the top after nano fluid droplets are solidified, the gap and instability generated by pure medium droplet stacking solidification are solved through a dropwise stacking technology, and a more accurate three-dimensional structure is built;
2. meanwhile, the unit shapes of the control column (line) and the tower-shaped structure can be obtained by changing the size of the single-section platform, and more various structural designs can be realized.
Drawings
Fig. 1 is a schematic view of an apparatus for implementing the dropwise solidification, stacking and molding of nano-fluid droplets in the present invention;
fig. 2 is a schematic diagram of pure medium and nanofluid droplet stack formation as described in the working principle of the present invention;
fig. 3 is a diagram of the actual measurement result of stacking and forming pure medium and nano-fluid droplets according to the working principle of the present invention;
in the figure:
1-a circulating cooling device;
2-a load floor;
3-a refrigerant inlet;
4-a refrigerant outlet;
5-constant temperature injector;
6-nanofluid droplets;
7-solidified nanofluid droplets;
8-pure media drop-by-drop stacking of the shaped structures (schematic);
9-nanofluid drop-wise stacking of the molded structures (schematic);
10-stacking the formed structure drop by drop with pure medium (actual measurement);
the 11-nanofluid was stacked drop-wise to form a structure (measured).
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Referring to fig. 1, a stacking and forming device based on nano fluid droplet solidification comprises an injection unit for dripping droplets and a low-temperature platform for droplet solidification, wherein the injection unit comprises a constant-temperature injector 5, the low-temperature platform comprises a circulating cooling device 1 provided with a refrigerating working medium inlet 3 and a refrigerating working medium outlet 4, and a bearing bottom plate 2 arranged on the circulating cooling device 1, and a cooling liquid working medium is introduced into the circulating cooling device 1 in a circulating manner, so that the bearing bottom plate 2 is in a low-temperature state. The method is characterized in that a low-temperature platform is adopted to provide enough supercooling degree, nanometer fluid drops which are dripped on a bearing bottom plate 2 drop by drop through a constant-temperature injector 5 are pushed from the bottom surface to the top surface of the drops, after the nanometer fluid drops are completely solidified, nanometer particles move along with compensating flow and are densely accumulated to the top surface to form a smooth platform, and based on a platform structure formed after the nanometer fluid drops are solidified, a dropwise stacking process is utilized to prepare a columnar or tower-shaped structure with a large height-diameter ratio through one-step forming.
The bearing bottom plate 2 is made of a heat conduction material which is good in chemical stability and not prone to corrosion or oxidation, the bearing bottom plate is connected with the temperature controller, the temperature is controlled through the temperature controller, the working temperature of the low-temperature platform is set according to the freezing point of the selected nano fluid suspension, and a cooling liquid working medium which is introduced into the circulating cooling device in a circulating mode is an ethylene glycol aqueous solution with the mass concentration of 40%.
This example uses water-based TiO2The nano-fluid dropwise solidification stacking forming is carried out by adopting the stacking forming device, and comprises the following steps:
step (1): the prepared nano fluid base liquid is deionized water, and the nano particles are anatase TiO2Particle size 40nm, particle volume concentration of 0.3%, adding 0.8mM sodium dodecyl sulfate SDS as dispersant and stabilizer.
Step (2): the circulating cooling device 1 uses a cooling working medium which is 40% glycol aqueous solution, the working temperature is set to be-20 ℃, the flow rate is 6L/Min, the bearing bottom plate 2 is 1mm thick and 4 multiplied by 4cm2The smooth copper sheet is fixed on the top of the circulating cooling device 1 by heat conducting glue.
And (3): the temperature of the constant temperature injector 5 is set to be room temperature (20 ℃), the inner diameter and the outer diameter of the selection nozzle (needle) tube are respectively 0.4mm and 0.5mm, and the dropping diameter of the nanometer fluid liquid drop 6 is about 2 mm. The actual measurement temperature of the bearing bottom plate 2 is-18 ℃, the nano fluid droplets 6 drop to contact with the bearing bottom plate 2 to be solidified and nucleated, the solidification front surface is approximately pushed along the vertical direction to finally form cylindrical solidification droplets 7, and the solidification time of a single droplet is about 10 s.
And (4): after waiting for the first nanofluid droplet 6 to solidify, the nanofluid droplet 6 is continuously placed right in the center of the platform of the solidified droplet 7, so that a second cylinder or circular truncated cone can be formed, and the process is repeated, and higher cylinders 9 (schematic) and 11 (actual measurement) can be stacked.
And (5): the more complicated structure can fix the constant temperature injector 5 on an XYZ three-dimensional moving table, and the three-dimensional printing function can be realized by regulating and controlling the placement position and the height of the nano fluid droplets 6 through a preset computer program.
As shown in fig. 2 and 3, the pure medium drop by drop stacking structure 8, 10 and the nano fluid drop by drop stacking structure 9, 11 show the mechanism of forming the platform structure at the top after the nano fluid drops are solidified by the utility model, and the gap and instability generated by the pure medium drops stacking and solidifying can be solved by the drop by drop stacking technology, so as to build a more accurate three-dimensional structure; meanwhile, the unit shapes of the control column (line) and the tower-shaped structure can be obtained by changing the size of the single-section platform, and more various structural designs can be realized.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.
Claims (4)
1. A stacking and forming device based on nano fluid liquid drop solidification is characterized by comprising an injection unit for dropping liquid drops and a low-temperature platform for solidifying the liquid drops,
the low-temperature platform comprises a circulating cooling device provided with a refrigerating working medium inlet and a refrigerating working medium outlet, and a bearing bottom plate arranged on the circulating cooling device, wherein a cooling liquid working medium is circularly introduced into the circulating cooling device, so that the bearing bottom plate is in a low-temperature state;
the bearing bottom plate is made of heat conducting materials;
the bearing bottom plate is a smooth copper sheet and is fixed at the top of the circulating cooling device by using heat-conducting glue;
the bearing bottom plate is connected with the temperature controller and controls the temperature through the temperature controller;
the injection unit is connected to the mobile control device and is matched with a computer program to change the placement position of the liquid drops, so that the three-dimensional printing function is realized.
2. The stacking and forming device based on nano fluid droplet solidification of claim 1, wherein the cooling liquid working medium circulated in the circulating cooling device is a glycol aqueous solution with a mass concentration of 40%.
3. The nanofluid droplet solidification-based stack molding apparatus according to claim 1, wherein the injection unit comprises an injector.
4. The nanofluid droplet solidification-based stack forming device according to claim 3, wherein the injector is a constant temperature injector.
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| CN202023267287.4U CN215203467U (en) | 2020-12-29 | 2020-12-29 | Stacking forming device based on nano fluid droplet solidification |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324072A (en) * | 2022-01-17 | 2022-04-12 | 四川大学 | Method for measuring surface tension coefficient of liquid by thin plate method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324072A (en) * | 2022-01-17 | 2022-04-12 | 四川大学 | Method for measuring surface tension coefficient of liquid by thin plate method |
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