Classifying Apparatus Rotor Blade Geometry for Particle Separation
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Solution Overview
Problem
Conventional classifying apparatuses experience an increase in classified particle size towards the inner periphery, leading to mixing of coarse particles with fine particles, which affects the sharpness of particle size distribution and classification accuracy.
Innovation Solution
A classifying apparatus with a rotor having blades and classification chambers that maintain a constant classified particle size across the radial region by adjusting blade height and thickness, ensuring particles larger than the classified size are expelled outward and smaller particles are moved inward, thereby preventing mixing and achieving a sharp particle size distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotor rotates at high speed to classify particles, then classification function is achieved, but classified particle size increases towards the inner periphery causing mixing of coarse and fine particles
Solution Approach 1:
The patent applies local quality by making the blade height variable along the radial direction. Specifically, the blade height increases from the outer periphery toward the inner periphery of the rotor. This local variation in blade geometry compensates for the centrifugal force distribution, maintaining a constant classified particle size across different radial positions and preventing mixing of coarse and fine particles.
Solution Approach 2:
The patent changes the geometric parameter of the blade (height) to resolve the contradiction. By increasing blade height toward the inner periphery, the drag force on particles is adjusted to balance the centrifugal force variation, thereby maintaining a constant classified particle size throughout the classification chamber and improving particle size distribution sharpness.
2Manufacturing precision
If blade height is increased toward the inner periphery to maintain constant classified particle size, then particle size distribution sharpness is improved, but rotor structure complexity increases
Solution Approach 1:
The patent implements local quality by varying the blade height only in the radial direction while keeping other blade parameters relatively simple. This localized geometric modification achieves the goal of constant classified particle size without requiring complex overall rotor结构设计，thereby limiting the increase in device complexity.
3Measurement precision
If constant classified particle size is maintained across the radial region, then classification accuracy is improved, but blade geometry becomes more complex
Solution Approach 1:
The patent changes the blade height parameter along the radial direction to maintain constant classified particle size. This single parameter modification (blade height variation) is sufficient to achieve improved classification accuracy without requiring complex changes to other blade geometric parameters, thus limiting the increase in overall blade geometry complexity.
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 solution ensures a constant classified particle size from the outer to the inner periphery, effectively preventing coarse particles from mixing with collected fine particles, resulting in a sharp particle size distribution and high classification accuracy.
Implementation Method 1
the particles in the fluid are subjected to a centrifugal force due to a high speed rotation of the rotor 2
Implementation Method 2
a drag R acting opposite to the centrifugal force F due to a fluid flowing toward an inner peripheral side
Data Source
AI summary
An apparatus for classifying fine particles in slurry provides a sharp particle size distribution with few mixed coarse particles and high classification accuracy.The apparatus includes a rotor (15) including classification chambers (17) between blades (16) radially arranged at circumferentially regular intervals, and classifies particles so that a classified particle size is constant in an entire radial region from an outer periphery to an inner periphery of the classification chamber. The blade (16) of the rotor has a circumferential thickness t(d) increasing toward the outer periphery, and the classification chamber (17) has a width increasing toward the inner periphery.