Powder Classifying Device with Tangential Air Nozzles
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Solution Overview
Problem
Conventional powder classifiers struggle with high accuracy and operability when classifying particulates of sizes equal to or smaller than several micrometers or sub-microns, due to complex structures and inadequate particle size control and maintenance.
Innovation Solution
A powder classifying device featuring a disc-like cavity with guide vanes and adjustable air nozzles that blow compressed air tangentially, allowing for precise classification and collection of fine and coarse particles, with a simplified structure for easy maintenance and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional powder classifiers use complex structures to classify fine particles, then classification capability is improved, but device complexity and maintenance difficulty increase
Solution Approach 1:
The device is divided into functionally independent modules: a classification chamber with guide vanes for particle separation, a separate compressed air supply system with adjustable nozzles for particle introduction and circulation, and distinct collection outlets for fine and coarse particles. This modular segmentation allows each component to be optimized independently while simplifying overall maintenance and operation.
2Adaptability or versatility
If conventional classifiers use fixed structures, then manufacturing is simpler, but particle size control and adaptability are reduced
Solution Approach 1:
The device incorporates adjustable compressed air nozzles that can vary the intensity and direction of air streams introduced into the classification chamber. This dynamic control mechanism allows operators to adjust classification parameters for different particle sizes and distributions without requiring complex mechanical adjustments to the guide vanes or chamber structure, thereby maintaining manufacturing simplicity while enhancing adaptability.
3Measurement precision
If conventional classifiers process fine particles, then classification capability is improved, but mixing of fine and coarse particles occurs reducing purity
Solution Approach 1:
The device extracts and separates fine particles from coarse particles through distinct collection mechanisms. Fine particles that follow the circulating air streams are directed to a separate fine particle collection outlet, while coarse particles that settle under gravity are collected through a different outlet. This extraction approach prevents mixing and ensures high purity for both particle size fractions.
4Productivity
If conventional classifiers increase installation area, then processing capacity is improved, but space requirements increase
Solution Approach 1:
The device utilizes vertical space through a multi-level configuration where the classification chamber, air nozzles, and collection outlets are arranged in three-dimensional space. The guide vanes are positioned at specific angles and heights within the chamber, and air nozzles are distributed both above and below the classification plane, maximizing processing capacity within a compact footprint by exploiting the vertical dimension rather than requiring extensive horizontal area.
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 device achieves high accuracy in classifying particulates of sizes equal to or smaller than several micrometers or sub-microns, offering easy particle size control and reduced installation area requirements, while preventing mixing of fine and coarse particles.
Implementation Method 1
a plurality of air nozzles that are arranged below the plurality of guide vanes on an outer peripheral wall of the disc-like cavity along a tangential direction of the outer peripheral wall and blow compressed air into an inside of the disc-like cavity
Implementation Method 2
powder is classified according to the balance between centrifugal force given by the circulating stream to the powder which falls from the powder path to spaces between the guide vanes, and drag
Implementation Method 3
powder is classified according to the balance between centrifugal force given by the circulating stream to the powder which falls from the powder path to spaces between the guide vanes, and drag
Data Source
AI summary
The powder classifying device classifies powder having a particle size distribution and collects the classified powder. The device includes a disc-like cavity to which the powder is supplied and where the supplied powder is classified, a powder supply port for supplying the powder to the cavity, guide vanes arranged so as to extend from an outer periphery of the cavity in an inner direction at a predetermined angle, a discharge unit for air streams including fine particles discharged from the cavity, a collection unit for coarse particles discharged from the cavity and air nozzles arranged below the guide vanes on an outer peripheral wall of the cavity along a tangential direction of the outer peripheral wall and blow compressed air into an inside of the cavity.