Crystallization Stirring Blade Merges Liquid Supply to Reduce Clearance
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Solution Overview
Problem
Existing crystallization devices face challenges in minimizing the clearance between the stirring blade and the reaction liquid supply nozzle without requiring high manufacturing accuracy, which affects the uniformity and quality of particle production.
Innovation Solution
The device incorporates a stirring blade with radially penetrating holes and a second liquid supply portion on the blade to supply reaction liquid close to the blade's periphery, allowing for efficient mixing and shearing force application without high manufacturing precision, using a cylindrical or columnar shape with porous plates and multiple supply points for uniform mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the rotation rate of the stirring blade is increased to promote reaction and generate fine particles, then particle uniformity and quality are improved, but the degree of difficulty of minimizing the clearance between the stirring blade and the reaction tank or reaction liquid supply nozzle increases
Solution Approach 1:
The reaction liquid supply nozzle is integrated with the stirring blade into a single compound structure. The stirring blade includes a blade body with a liquid supply channel that extends from the center toward the outer periphery, with a liquid supply outlet at the outer periphery. This merging eliminates the separate nozzle component and its associated clearance requirements, allowing the reaction liquid to be supplied directly at the location where it is needed while rotating with the blade, thus resolving the manufacturing difficulty without compromising particle quality.
2Productivity
If the clearance between the stirring blade and the reaction liquid supply nozzle is minimized to achieve efficient shearing force transmission, then particle size uniformity and quality are improved, but the manufacturing accuracy requirements increase
Solution Approach 1:
The reaction liquid supply function is merged into the stirring blade structure itself. The liquid supply channel is formed within the blade body, and the liquid supply outlet is positioned at the outer periphery of the blade. This integration eliminates the need for a separate reaction liquid supply nozzle and its associated clearance control requirements, while maintaining efficient shearing force transmission for high-quality particle generation.
3Force
If a separate reaction liquid supply nozzle is used close to the stirring blade, then efficient shearing force transmission is achieved, but the device complexity and manufacturing accuracy requirements increase
Solution Approach 1:
The stirring blade and reaction liquid supply nozzle are merged into a single integrated structure. The stirring blade includes a blade body with an embedded liquid supply channel that extends from the center toward the outer periphery, with the liquid supply outlet positioned at the outer periphery. This integration reduces device complexity by eliminating separate nozzle components while maintaining efficient shearing force transmission for high-quality particle generation.
Solution Approach 2:
The stirring blade is designed to perform multiple functions simultaneously: it provides mechanical stirring to generate shearing force for particle formation, and it serves as the reaction liquid supply conduit through its integrated liquid supply channel and outlet. This multi-functionality reduces the number of components and simplifies the overall device structure while maintaining effective particle generation.
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
This design enables uniform and fine particle production by minimizing clearance and applying shearing force effectively, reducing power consumption and manufacturing complexity.
Implementation Method 1
a liquid mixture of the first reaction liquid and the second reaction liquid reacts while passing through the holes toward a radially outer side of the stirring blade and moving to an outer peripheral side of the stirring blade, due to the influence of a centrifugal force
Implementation Method 2
stirring is promoted by rotating a stirring blade provided in a liquid mixture of a plurality of raw material solutions to apply a shearing force to the liquid mixture
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A crystallization device (4) includes a stirring blade (We, Wg) including a plurality of radially penetrating holes (18h) and rotating about a center axis (O1), a reaction tank (1) having a bottomed cylindrical shape and concentrically accommodating the stirring blade (We, Wg) inside, a first liquid supply portion (5a) provided on the reaction tank (1) and supplying a first reaction liquid (L1) to the inside of the reaction tank (1), and second liquid supply portions (50b) provided on the stirring blade (We, Wg) and supplying a second reaction liquid (L2) to the inside of the reaction tank (1). The stirring blade (We, Wg) includes a columnar portion (20) having a columnar shape, a disk base portion (18) provided concentrically with the columnar portion (20) on an upper end portion of the columnar portion (20), a rotating shaft (3) extending upward along the center axis (O1) from a center of the disk base portion (18) in plan view, and a porous plate (18P) having a cylindrical shape and provided concentrically with the columnar portion (20) on a radially outer side of the columnar portion (20). The porous plate (18P) extends downward from an outer edge of the disk base portion (18). The second reaction liquid (L2) is flowable inside the rotating shaft (3), the disk base portion (18), and the columnar portion (20). The plurality of second liquid supply portions (50b) are provided on an outer peripheral surface (20o) of the columnar portion (20) at intervals in an up-down direction.