Disc Cavity Powder Classifier with Symmetrical Air Nozzles
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Solution Overview
Problem
Conventional powder classifying apparatuses face challenges in generating a uniform whirling gas stream for sorting fine particles, leading to nonuniform airflow and adhesion of powder to the cavity walls, which deteriorates classification accuracy and efficiency, especially when dealing with submicron-sized particles.
Innovation Solution
The apparatus features a disc-like cavity with symmetrical whirling gas streams generated by first and second air introducing sections, comprising air nozzles at the upper and lower peripheral walls, and powder supply ports inclined to align with the whirling direction, minimizing airflow disturbance and maintaining uniformity over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If air nozzles are used to generate whirling gas stream in the disc-like cavity, then fine particles can be separated by centrifugal force, but the airflow becomes nonuniform and powder adheres to the cavity walls
Solution Approach 1:
The single air nozzle is divided into multiple air nozzles arranged symmetrically around the disc-like cavity. This segmentation allows the airflow to be distributed uniformly, preventing nonuniform whirling gas stream and powder adhesion to cavity walls, while still generating sufficient centrifugal force for accurate classification of fine particles.
Solution Approach 2:
The air nozzles are positioned asymmetrically at specific locations around the cavity perimeter, with each nozzle oriented at a specific angle relative to the cavity axis. This asymmetric arrangement creates a symmetric whirling flow pattern that maintains uniformity while generating the necessary centrifugal force for particle separation.
2Productivity
If compressed air is blown into the disc-like cavity through air nozzles to enhance whirling motion, then finer particles can be sorted, but powder adhesion to wall surfaces increases and classification accuracy deteriorates
Solution Approach 1:
Compressed air is introduced at specific localized positions around the cavity perimeter through multiple air nozzles, rather than through a single central nozzle. This local quality approach ensures that the whirling gas stream is generated uniformly throughout the cavity, preventing powder adhesion to wall surfaces while maintaining high classification accuracy for fine particles.
Solution Approach 2:
Multiple air nozzles act as intermediaries to distribute compressed air uniformly around the cavity, mediating between the compressed air source and the whirling gas stream. This intermediary arrangement prevents direct, concentrated airflow that would cause nonuniformity and powder adhesion, while still achieving the desired whirling motion for fine particle separation.
3Ease of operation
If guide vanes are used to generate whirling gas stream, then powder can be separated into coarse and fine powder, but the system becomes complex and difficult to maintain
Solution Approach 1:
The guide vanes are completely removed from the system and replaced with air nozzles that directly generate the whirling gas stream through compressed air injection. This extraction of the complex guide vane structure simplifies the overall device design, reduces maintenance requirements, while preserving the powder separation capability through the simpler air nozzle mechanism.
Solution Approach 2:
The mechanical guide vane system is replaced with a pneumatic system using air nozzles to generate the whirling gas stream. This substitution eliminates moving mechanical parts that require maintenance, reducing device complexity while maintaining the essential function of separating powder into coarse and fine fractions through centrifugal force.
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 configuration ensures accurate and stable classification of fine powders up to submicron sizes without adhesion to the cavity walls, maintaining high classification accuracy and efficiency over extended periods.
Implementation Method 1
a whirling gas stream generated in a disc-like cavity serving as a classifying site
Implementation Method 2
separating the powder into coarse powder and fine powder by a centrifugal force
Implementation Method 3
the fine powder being collected from the central part of the whirling gas stream and the coarse powder being collected from a lower peripheral portion of the whirling gas stream
Implementation Method 4
a balance between a centrifugal force imparted to the powder by a whirling gas stream and a drag over long periods of time
Data Source
AI summary
A powder classifying apparatus for classifying powder that has a granularity distribution and recovering fine powder has: a casing provided with two disc-shaped members and a surrounding wall member, a disc-shaped hollow section for classifying powder using a spinning airflow in the interior thereof being formed on the inner side of the casing; at least one powder supply opening for supplying powder into the disc-shaped hollow section; a discharge section for discharging air including fine powder discharged from the disc-shaped hollow section; a recovery unit formed in the thickness-wise center of the surrounding wall member of the casing and provided with a slit-shaped opening for recovering coarse powder discharged from the disc-shaped hollow section; and two air introduction units provided with a plurality of air introduction devices for introducing air into the disc-shaped hollow section in order to form the rotational airflow inside the disc-shaped hollow section.