Powder Classifying Apparatus Annular Slit Segmentation
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Solution Overview
Problem
Existing powder classifying apparatuses struggle to achieve a lower classification point while maintaining classification accuracy, as the classification point is determined by air volume balance and cannot effectively separate fine and coarse powders to achieve smaller particle sizes.
Innovation Solution
The apparatus incorporates an annular slit between the central and outer portions of the centrifugal chamber, allowing for further separation of coarse powder before it reaches the fine powder collection, using a centrifugal chamber with a disc shape and gas supply to generate a whirling stream, and a cylindrical first wall portion at the fine powder collecting pipe opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the classification point is lowered to achieve smaller particle sizes, then the fine powder particle size is reduced, but the classification accuracy deteriorates due to air volume balance limitations
Solution Approach 1:
The centrifugal chamber is divided into multiple radial zones with different suction ports: a central opening portion for fine powder collection, an intermediate annular slit for intermediate particle removal, and an outer region for coarse powder collection. This segmentation allows different particle size ranges to be separated at different radial positions, enabling lower classification points while maintaining accuracy for each size fraction.
Solution Approach 2:
Different regions of the centrifugal chamber are assigned different functions based on local particle distribution: the central region collects fine powder, the intermediate annular region removes intermediate particles, and the outer region collects coarse powder. Each region has optimized suction characteristics tailored to its local particle concentration and size distribution, improving overall classification accuracy at lower classification points.
2Device complexity
If a single suction port configuration is used, then the device structure is simple, but the ability to separate fine and coarse powders effectively is limited
Solution Approach 1:
The suction system is segmented into multiple independent suction ports at different radial positions: a central opening portion surrounded by an annular slit. Each suction port can be independently controlled to optimize separation efficiency for different particle size ranges, achieving effective fine and coarse powder separation without excessive structural complexity.
Solution Approach 2:
The annular slit acts as an intermediary element between the central fine powder collection region and the outer coarse powder region. It provides an additional separation interface that captures intermediate particles, thereby improving the overall separation efficiency and enabling better control over the classification point while maintaining a relatively simple device structure.
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 enables a lower classification point with maintained accuracy, achieving finer particle sizes by effectively separating coarse powder from the fine powder collection before it reaches the fine powder section.
Implementation Method 1
a balance between a centrifugal force imparted to the powder through a whirling stream formed from gas and a drag
Implementation Method 2
a balance between a centrifugal force imparted to the powder through a whirling stream formed from gas and a drag
Data Source
AI summary
This powder-classifying apparatus has: a centrifugation chamber configured so as to be sandwiched between two opposing members; an air supply unit that supplies air into the centrifugation chamber and generates a swirl flow; a raw material supply unit that supplies raw-material powder into the swirl flow; a fine powder recovery unit having an opening part through which air that includes fine powder classified within the centrifugation chamber is ejected to outside of the centrifugation chamber; a coarse powder recovery unit provided to the outer edge part of the centrifugation chamber, for ejecting classified coarse powder to outside of the centrifugation chamber; and an annular slit provided to at least one of the members that constitute the centrifugation chamber, the slit being provided in a region between the center part of the centrifugation chamber and the outer edge part.