CN110817294A - Conical spiral bubble conveying device and preparation method thereof - Google Patents
Conical spiral bubble conveying device and preparation method thereof Download PDFInfo
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- CN110817294A CN110817294A CN201911049874.5A CN201911049874A CN110817294A CN 110817294 A CN110817294 A CN 110817294A CN 201911049874 A CN201911049874 A CN 201911049874A CN 110817294 A CN110817294 A CN 110817294A
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- 238000007664 blowing Methods 0.000 claims description 6
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- 238000007598 dipping method Methods 0.000 claims description 6
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G33/00—Screw or rotary spiral conveyors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/02—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to separate articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
- B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G33/00—Screw or rotary spiral conveyors
- B65G33/24—Details
- B65G33/26—Screws
- B65G33/265—Screws with a continuous helical surface
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Manufacturing & Machinery (AREA)
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Abstract
The conical spiral bubble conveying device comprises a conical spiral body, the conical spiral body is gradually reduced from a starting end to a convergence end, the starting end of the conical spiral body is an inclined positive quadrilateral, and the vertical edge of the positive quadrilateral is gradually increased upwards in a conical spiral manner. The diameter of the air bubble is larger than the height of the inner side surface of the conical spiral body, the wedge angle can generate Laplace force on the air bubble, meanwhile, the curvature of the conical spiral generates curvature driving force on the air bubble, and under the combined action of the two forces, the air bubble can be driven to move towards the conical top by utilizing the conical spiral device. The transportation of the antigravity and the antibuoyancy of the bubbles is realized.
Description
Technical Field
The invention relates to a bubble conveying device and a preparation method thereof, in particular to a conical spiral bubble conveying device and a preparation method thereof.
Background
The generation, controllable collection and directional transportation of bubbles play an important role in many modern science and technology fields. Such as air bubbles, have important applications in many natural and technological processes, such as in polymerization, dispersion, extraction, detergent and cosmetic production, and liquid boiling and condensation processes; in the liquid environment, the bubbles have important application in the fields of four-dimensional color ultrasonography, material transfer, particle flotation, water purification, electrochemistry, corrosion prevention, drag reduction and the like.
How to realize antigravity self-conveying of bubbles in an air environment, overcoming the action of gravity, changing the conveying direction and speed of the bubbles and relating to the application of the bubbles in a three-dimensional space in the air environment.
Also, in a liquid environment, it is inherently difficult to achieve effective directional transport control for bubbles of large diameter, which rise rapidly in the liquid medium due to the large buoyancy effect. Due to the buoyancy vertically upwards, the bubbles will move straight upwards and eventually be released into the atmosphere. Thus, industrial and agricultural processes involve the treatment of gas bubbles, such as wastewater treatment and flotation recovery of fine mineral particles, often using their buoyancy. In addition, when the presence of bubbles causes adverse effects, such as CO in an aqueous medium2Or H2The S microbubbles accelerate the hydrogenation of the metal and form hydrogen pores on the surface, which in turn causes severe corrosion of the pipes and shortens the life of the equipment, and most of the conventional methods selected for eliminating bubbles utilize buoyancy, including chemical and physical methods, but their elimination of bubbles in complex spatial structures often requires anti-buoyancy operations.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the conical spiral bubble conveying device which is simple in structure and can adjust the bubble conveying direction, speed and distance through different parameter settings.
In order to achieve the purpose, the invention adopts the following technical scheme:
the conical spiral bubble conveying device comprises a conical spiral body, the conical spiral body is gradually reduced from a starting end to a convergence end, the starting end of the conical spiral body is an inclined positive quadrilateral, and the vertical edge of the positive quadrilateral is gradually increased upwards in a conical spiral manner.
In the conical spiral bubble conveying device, the number of the conical spiral body is 5-7.
The preparation method of the conical spiral bubble conveying device comprises the following steps:
preparing a three-dimensional conical spiral body by using a 3D printer;
step two, preparing a rough micro-nano structure: scanning the surface of the conical spiral body by femtosecond laser to obtain a rough micrometer structure;
step three, preparing a super-hydrophobic substrate: dipping a proper amount of super-hydrophobic solution by using a brush, uniformly coating the super-hydrophobic solution on the inner surface of the conical spiral body, putting the sample on a drying table adjusted to 60 ℃ for drying, standing for 15 minutes and ensuring that the solvent is completely volatilized, and then repeatedly dipping, coating and drying for five times;
and step four, dripping the lubricant, blowing and wiping the surface by electric air blowing to remove the redundant lubricant, and forming a layer of lubricating film on the surface of the substrate.
The conical spiral body of the invention is unfolded along a straight line, and the inner wall of the conical spiral body has a wedge angle of
And the size of the wedge shape is gradually increased from the bottom to the cone top.
The conical helix is gradually reduced from the bottom to the conical top, so that the curvature gradient is larger and larger, and the larger the change rate of the curvature is, the stronger the generated curvature driving force is.
The diameter of the air bubble is larger than the height of the inner side surface of the conical spiral body, the wedge angle can generate Laplace force on the air bubble, meanwhile, the curvature of the conical spiral generates curvature driving force on the air bubble, and under the combined action of the two forces, the air bubble can be driven to move towards the conical top by utilizing the conical spiral device.
The same transportation distance, namely the distance from the bottom to the top of the conical helix for transporting the bubbles is the same, namely under the condition that the height of the conical helix is certain, the more the number of turns of the conical helix is, the larger the distance for the bubbles to travel, so that the number of turns of the conical helix is as small as possible within a certain transportation distance; however, the speed of the bubbles is limited due to the small number of turns, so the number of turns must be controlled within a certain range, and the speed of the bubbles, the passing time and the distance meet the requirements of transportation. Through the experiment, the number of turns of the conical helix is optimal when 5-7 turns are carried out, the air bubbles can be transported for a specified distance, the transporting speed of the air bubbles can meet the requirement, and meanwhile the transporting time of the air bubbles can be controlled.
In a liquid environment, a super-hydrophobic substrate is prepared on the surface of the conical helix, so that bubbles can be adsorbed on the inner surface of the conical helix. And a lubricant is dripped on the surface of the conical spiral body, so that the transportation friction force of bubbles can be reduced.
HFE7100 can be used as a lubricant, which is composed of methyl nonafluorobutyl ether, has low surface tension and low viscosity, and can reduce viscous resistance during air bubble transportation.
The invention has the beneficial effects that:
1) in a working environment, the wedge-shaped Laplace force and the curvature driving force are combined into a bubble driving force to drive the bubbles to move towards the top along the wedge-shaped conical helix, so that antigravity operation can be realized, and for example, the bubbles can be conveyed by obliquely placing the invention.
2) By adjusting the vertical side length of the quadrilateral of the section of the conical helixL 1、L 2The size of the wedge angle of the wedge can be changed, and the size of the Laplace force can be adjusted; by appropriate adjustment of the angle of taper of the conical helixα 2Pitch of the conic helixhThe radius r of the conical helix can change the curvature of the conical helix, and further the curvature driving force is adjusted; inclination angle between quadrangle of conic spiral section and Z axisα 1Determines the division of the driving force in the radial and axial directions by varyingα 1To vary the relative magnitudes of the radial and axial driving forces.
The invention can adapt to the transportation requirements of bubbles with different volumes, different transportation speeds and different transportation distances by adjusting the structural parameters.
3) In a liquid working environment, the radial driving force drives the bubbles to move along the wedge-shaped conical spiral body towards the cone top direction. If the cone top is inclined even downwards, the anti-buoyancy operation can be realized, and a series of adverse effects such as corrosion of the metal device by bubbles can be eliminated.
4) The invention is suitable for transporting bubbles with a complex space structure.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a schematic structural view of the present invention with a base installed.
Fig. 3 is a graph of the effect of different curvature gradients on transport conditions in an air environment.
Fig. 4 illustrates the effect of different wedge angles on transport conditions in an air environment.
Fig. 5 is a schematic diagram of a lateral transport process of bubbles in a liquid environment.
Fig. 6 shows the effect of different curvature gradients on transport conditions in a liquid environment.
Fig. 7 shows the effect of different wedge angles on transport conditions in a liquid environment.
Fig. 8 is a schematic diagram of the top-down transport process of bubbles in a liquid environment.
Detailed Description
Example one
Referring to the attached drawings, the conical spiral bubble conveying device comprises a conical spiral body, and the structure of the conical spiral body in a three-dimensional space coordinate system is as follows:
the inclination angle with the Z axis is α1Side length of L2Is a regular quadrangle with a pitch of h and a taper of
The spiral line of the regular quadrangle gradually increases upwards, and two vertical opposite sides of the regular quadrangle linearly increase to L1The radius of the bottom of the helix is r and the number of turns is n.
Modeling by using three-dimensional software, and enabling the bionic cone helix to take the following structural parameters:α 1=45°，α 2=30°，L 1=3 mm，L 2=1mm，h=5 mm，n=7，r=10 mm; the three-dimensional conical helix can be prepared by adopting a 3D printing technology.
The conical screw device is fixed on the base, and then the base is arranged at the initial position of bubble transportation, so that bubbles can be transported, and the bubbles are transported from the bottom of the conical screw to the conical top. If the conical helix is obliquely arranged, the defect that the existing bubbles can only be transported by air buoyancy can be overcome, and the transporting direction, speed and time of the bubbles can be controlled.
Example two
Referring to the attached drawings, the embodiment adopts the following steps on the basis of the prepared conical screw device in the first embodiment:
step two, preparing a rough micro-nano structure: scanning the surface of the conical spiral body by femtosecond laser to obtain a rough micrometer structure;
step three, preparing a super-hydrophobic substrate: dipping a proper amount of super-hydrophobic solution by using a brush, uniformly coating the super-hydrophobic solution on the inner surface of the conical spiral body, putting a sample on the surface of a drying table adjusted to 60 ℃ for drying, standing for 15 minutes and ensuring that the solvent is completely volatilized, and then repeatedly dipping, coating and drying for five times;
and step four, dripping HFE7100 lubricant, blowing and wiping the surface by electric blowing to remove the redundant lubricant, and forming a layer of lubricating film on the surface of the substrate.
The conical helix body is subjected to super-hydrophobic treatment on the surface and is dropwise added with the lubricant, so that the conical helix body can be applied to a liquid environment.
In the anti-buoyancy test of the embodiment, as shown in fig. 5 and 8, a certain volume of air bubbles are taken by a liquid gun in an underwater environment and released at the bottom of the conical spiral body, and the air bubbles are observed by a high-speed camera and conveyed downwards along the bottom of the conical spiral body in an anti-buoyancy self-driven manner. As can be seen from the figure, the bubbles in the underwater environment transversely and downwards along the inner wall of the wedge-shaped conical spiral structure realize the anti-buoyancy transportation against the buoyancy effect.
FIG. 6 is a graph of changing the base radius of the helix of a conical helixrThe volume and the speed of the bubbles can be regulated and controlled. For a certain volume of bubbles, the spiral parameterrThe larger the curvature gradient, the smaller the driving force obtained.
FIG. 7 is a graph of the modulation of bubble volume and velocity achieved by varying the base structure wedge angle α the greater the wedge angle, the greater the driving force achieved for a certain volume of bubbles.
Claims (3)
1. The conical spiral bubble conveying device comprises a conical spiral body and is characterized in that the conical spiral body is gradually reduced from a starting end to a convergence end, the starting end of the conical spiral body is an inclined positive quadrilateral, and the vertical edge of the positive quadrilateral is gradually increased upwards in a conical spiral manner.
2. The conical helical bubble transport device according to claim 1, wherein the number of turns of the conical helical body is 5-7.
3. The preparation method of the conical spiral bubble conveying device comprises the following steps:
preparing a three-dimensional conical spiral body by using a 3D printer;
step two, preparing a rough micro-nano structure: scanning the surface of the conical spiral body by femtosecond laser to obtain a rough micrometer structure;
step three, preparing a super-hydrophobic substrate: dipping a proper amount of super-hydrophobic solution by using a brush, uniformly coating the super-hydrophobic solution on the inner surface of the conical spiral body, putting the sample on a drying table adjusted to 60 ℃ for drying, standing for 15 minutes and ensuring that the solvent is completely volatilized, and then repeatedly dipping, coating and drying for five times;
and step four, dripping the lubricant, blowing and wiping the surface by electric air blowing to remove the redundant lubricant, and forming a layer of lubricating film on the surface of the substrate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911049874.5A CN110817294A (en) | 2019-10-31 | 2019-10-31 | Conical spiral bubble conveying device and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911049874.5A CN110817294A (en) | 2019-10-31 | 2019-10-31 | Conical spiral bubble conveying device and preparation method thereof |
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