Fluid Classifier Powder Adhesion Prevention via Heated Gas
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Solution Overview
Problem
Conventional powder classification methods face challenges in maintaining classifier efficiency and preventing powder adhesion, especially when classifying particles with diameters less than 1 µm, leading to blockages and reduced performance.
Innovation Solution
A method involving a fluid classifier where the powder is mixed with an auxiliary agent, such as ethanol, and heated gas is supplied to prevent adhesion, allowing effective classification of fine powders without blockages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional classification methods are used to classify fine powder with particle diameter less than 1 μm, then classification can be performed, but the powder adheres to the classifier causing blockages and reducing operation time
Solution Approach 1:
The patent introduces a heating mechanism that raises the temperature of the classifier interior to 50-200°C. This temperature parameter change prevents powder adhesion by reducing static electricity and improving powder流动性, thereby maintaining classification precision while enabling continuous long-term operation without blockages
Solution Approach 2:
The patent employs periodic reversal of the classifier's rotating direction. By periodically changing the rotation direction, powder that tends to adhere to the inner wall is prevented from accumulating, thus maintaining classification effectiveness and extending operation time without requiring shutdown for cleaning
2Manufacturing precision
If conventional classification methods are used for fine powder, then classification can be performed, but the input port and exhaust port become blocked due to powder adhesion
Solution Approach 1:
Heating the classifier interior to 50-200°C changes the thermal parameter, which prevents powder adhesion to the input port and exhaust port. This maintains smooth powder flow and sustained classification efficiency over extended operation periods
Solution Approach 2:
The heating function is activated before powder classification begins, creating a pre-heated environment that prevents powder adhesion from the start. This preliminary thermal preparation ensures ports remain clear and classification efficiency is maintained throughout operation
3Device complexity
If powder is classified without auxiliary agents, then the process is simpler, but powder particles clump together reducing classification efficiency
Solution Approach 1:
By changing the temperature parameter to 50-200°C, the patent eliminates the need for auxiliary chemical agents. The thermal energy prevents particle clumping through reduced static electricity, maintaining classification precision while simplifying the process to use only the classifier itself
Solution Approach 2:
The patent replaces the chemical approach (using auxiliary agents) with a thermal approach (heating). This substitution eliminates chemical additives while achieving the same effect of preventing particle aggregation, thereby simplifying the overall process
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 method ensures efficient classification of powders with particle diameters less than 1 µm by preventing adhesion within the classifier, improving the yield and longevity of the classification process.
Implementation Method 1
a heating function for heating the inside of the classifier
Implementation Method 2
a classification function for classifying the powder fed from the input port according to the particle diameter
Implementation Method 3
a rotating direction reversing function for periodically reversing the rotating direction of the classifier
Data Source
AI summary
A method for classifying powder using a fluid classifier includes: a mixing step of mixing a powder with an auxiliary agent made of an alcohol (step S10); a feeding step of feeding the powder mixed at the mixing step into the fluid classifier (step S22); a heating step of heating a gas (step S14); a supplying step of supplying the gas heated at the heating step to the fluid classifier (step S16); and a classifying step of classifying the powder in the fluid classifier based on a particle diameter (step S24).