Stirrer With Segmented Screen For Nano-Dispersion
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Solution Overview
Problem
Existing stirrers face challenges in efficiently processing fluids with small particle diameters, such as nanoparticle suspensions, due to performance deterioration, foreign matter generation, and high energy requirements, and struggle to achieve nano-level dispersion and emulsification.
Innovation Solution
A stirrer design with a rotor and screen that generates an intermittent jet flow by adjusting the relative velocities between forward and backward flows, optimizing the relationship between the blade edge width, slit width, and screen width to enhance liquid-liquid shear force, allowing for efficient processing and refinement of fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the rotation number of the impeller is increased to enhance shearing effect, then the dispersion and emulsification performance is improved, but the crystal condition of particle surface is destroyed and foreign matter is generated
Solution Approach 1:
The screen is divided into multiple segments with slits arranged in a circular pattern, allowing the fluid to be processed to pass through multiple opening points. This segmentation enables distributed shearing action across multiple locations, reducing localized damage while maintaining overall dispersion effectiveness
Solution Approach 2:
The screen acts as an intermediary component between the impeller and the fluid. It mediates the interaction by providing a controlled passage through slits, allowing the fluid to be processed to pass through while the impeller rotates, thereby achieving dispersion without direct contact that would destroy crystal structures
2Manufacturing precision
If the clearance between the impeller and screen is reduced to increase shearing intensity, then the particle refinement is improved, but the energy consumption increases significantly
Solution Approach 1:
The system utilizes periodic action through the rotation of the impeller, creating intermittent jet flow through the slits. This periodic motion allows the fluid to be processed to pass through the slits in cycles, achieving effective particle refinement over time without requiring continuously high energy input
Solution Approach 2:
The invention changes the geometric parameters of the system, specifically the slit width and screen configuration, to optimize the balance between shearing intensity and energy consumption. By adjusting these parameters, the system achieves effective particle refinement at lower energy costs
3Productivity
If the slit width is narrowed to increase the number of slits, then the shearing frequency is improved, but the flow amount of fluid through each slit decreases
Solution Approach 1:
The screen is segmented into multiple slits distributed around the circumference, allowing the fluid to be processed to pass through multiple opening points simultaneously. This segmentation increases the total shearing frequency while maintaining adequate flow amount through each individual slit
Solution Approach 2:
The slits are arranged in a circular pattern around the impeller, utilizing the circumferential dimension. This spatial arrangement allows multiple slits to operate in parallel, increasing overall shearing capacity without compromising the flow amount through each slit
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively increases the shear force and facilitates extremely fine dispersion and emulsification, achieving nano-level processing with a narrow particle size distribution and uniform particle diameter, outperforming conventional stirrers in efficiency and refinement.
Implementation Method 1
emulsification, dispersion, or mixing can be made by a liquid-liquid shear force in the velocity interface generated by the intermittent jet flow
Implementation Method 2
the rotor and the screen rotate relative to each other, whereby shearing a fluid to be processed in a very narrow space formed between the blades and the inner wall of the screen which has slits so that the fluid to be processed is discharged from inside the screen toward outside thereof through the slits as an intermittent jet flow
Data Source
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AI summary
The present invention addresses the problem of providing a stirrer capable of more effectively shearing a fluid to be treated, by using the action of an intermittent jet stream. Provided is a stirrer provided with a rotor having a blade 12 and a screen 9, which are relatively rotated such that the fluid to be treated is discharged from the inside of the screen 9 to the outside as an intermittent jet stream through a slit 18 in the screen 9, the stirrer satisfying condition 1 and condition 2. (Condition 1) the relationship among the width b in the rotating direction of a tip part 21 of the blade 12, the width s in the circumferential direction of the slit 18, and the width t in the circumferential direction of the screen member 19 is b ≥ 2s + t. (Condition 2) the relationship between the width b in the rotating direction of the tip part 21 of the blade 12 and the maximum inner diameter c of the screen 9 is b ≥ 0.1c.