Powder Classifying Device Segmentation and Flow Control
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Solution Overview
Problem
Existing powder classifying devices using guide vanes struggle to efficiently classify fine particles due to increased radial velocity and altered classification points when scaling up, making it difficult to achieve high processing capability for sub-micron powders.
Innovation Solution
A powder classifying device with multiple classifiers, each comprising a disk-shaped centrifuge chamber, annular powder dispersion and re-classifying chambers, and guide vanes or gas nozzles, controlled by a controller to equalize gas flow rates and pressures, ensuring consistent classification points across classifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dimensions of the device and volume of the classifying chamber are enlarged to improve processing capability, then the processing capability is improved, but the radial velocity of powder increases which changes the classification point to a greater value, making classification into fine particles difficult
Solution Approach 1:
The patent divides the single classifying chamber into multiple smaller classifying chambers (first classifying chamber and second classifying chamber). Each chamber operates at a smaller scale with controlled gas flow rates, maintaining appropriate classification points for fine particle separation while collectively providing high processing capability through parallel operation of multiple chambers.
2Productivity
If multiple powder classifiers are used to increase processing capability, then the processing capability is improved, but the classification points become inconsistent across classifiers, reducing classification accuracy
Solution Approach 1:
The patent implements a control device that receives particle size distribution information from detectors and adjusts gas supply flow rates to each powder classifier accordingly. This feedback mechanism ensures that all classifiers operate at consistent classification points by dynamically balancing the gas flow based on real-time particle size measurements, thereby maintaining classification accuracy while processing large amounts of powder through multiple parallel classifiers.
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 allows for high-capacity classification of fine particles with improved accuracy and processing capability by maintaining consistent classification points across multiple classifiers, enhancing the ability to handle sub-micron powders.
Implementation Method 1
a powder classifying device that classifies powder having a particle size distribution at a desired classification point and, in particular, to a powder classifying device that classifies a large amount of powder using a balance between a centrifugal force imparted to the powder by a whirling gas stream and a drag force generated by a gas stream
Implementation Method 2
a powder classifying device that classifies powder having a particle size distribution at a desired classification point and, in particular, to a powder classifying device that classifies a large amount of powder using a balance between a centrifugal force imparted to the powder by a whirling gas stream and a drag force generated by a gas stream
Implementation Method 3
a classifying device that uses guide vanes to generate a whirling gas stream, which imparts a whirling motion to powder, and centrifuges the powder into fine particles and coarse particles
Data Source
AI summary
A powder classifying device includes a plurality of powder classifiers that impart a whirling motion to powder with whirling gas streams to classify the powder into coarse powder and fine powder, a gas supply source that supplies the plurality of powder classifiers with gas for generating the whirling gas stream, a powder supplier that supplies the plurality of powder classifiers with powder having a particle size distribution, a fine powder collecting section that collects fine powder classified by each of the plurality of powder classifiers, a coarse powder recovery section that recovers coarse powder classified by each of the plurality of powder classifiers, and a controller that controls flow rates of gases supplied to the plurality of powder classifiers so that a classification point is substantially equal among the plurality of powder classifiers.