Classifier Distribution Channel for Uniform Airflow Velocity
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Solution Overview
Problem
Existing classifiers exhibit unsatisfactory selectivity in separating fine and coarse materials due to non-uniform airflow distribution, leading to a blurred separation sharpness and contamination of grain size distributions.
Innovation Solution
The airflow is made to enter the classification zone at a uniform rate by ensuring a constant quotient of time-dependent volume flow and flow cross-sectional area in the distributor channel, achieved by reducing the radial extension of the distribution channel and using air guide vanes to create a funnel effect, maintaining consistent airflow speed and enhancing selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the distribution channel maintains a constant cross-sectional area, then the structure is simple, but the airflow velocity decreases along the channel length causing non-uniform separation
Solution Approach 1:
The distribution channel transitions from a static constant cross-section design to a dynamic variable cross-section design where the height dimension changes along the flow direction. This dynamic geometric adjustment compensates for the natural velocity decay in compressible flow, maintaining uniform airflow velocity across the entire channel length and ensuring consistent separation performance.
Solution Approach 2:
The invention changes the geometric parameters of the distribution channel, specifically varying the height dimension h(x) as a function of position along the flow direction. This parameter change is designed to compensate for pressure drop and velocity reduction, transforming the channel from a simple rectangular prism to a more complex shape with controlled dimensional variation that optimizes flow uniformity.
2Manufacturing precision
If the cross-sectional area of the distribution channel is reduced along the flow direction, then the airflow velocity remains uniform, but the channel geometry becomes more complex
Solution Approach 1:
The distribution channel is designed with different geometric characteristics at different locations along the flow direction. The height dimension varies locally to compensate for velocity changes at each position, creating a non-uniform local geometry that achieves global flow uniformity. This local quality variation ensures that each section of the channel maintains appropriate velocity for precise separation.
Solution Approach 2:
Instead of modifying the cross-sectional area uniformly or using complex three-dimensional shaping, the invention achieves velocity compensation primarily through variation in the height dimension. This dimensional approach simplifies the overall geometric complexity while still achieving the desired flow uniformity, as the height variation can be implemented as a relatively simple extruded profile.
3Productivity
If air guide vanes are used to create a funnel effect, then the airflow is concentrated and velocity is maintained, but the device structure becomes more complex
Solution Approach 1:
Air guide vanes are introduced as intermediary elements within the distribution channel to shape and concentrate the airflow. These vanes act as mediators that redirect and focus the air flow toward the separation zone, creating a funnel effect that maintains velocity and enhances separation efficiency without requiring complex external structures.
Solution Approach 2:
The air guide vanes divide the distribution channel into multiple flow paths or zones, segmenting the airflow to achieve more uniform distribution and concentration. This segmentation allows better control over the flow pattern and velocity profile, improving separation efficiency by ensuring each region receives appropriately conditioned air.
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 approach ensures precise and consistent separation, maintaining a preselected separation limit and improving the sharpness of the separation process, resulting in higher selectivity and reduced contamination between fine and coarse material fractions.
Implementation Method 1
the separation effect is essentially based on the drag force exerted by the air on the material particles, and this drag force in turn depends primarily on the airflow velocity
Implementation Method 2
the coarses are forced downwards out of the screening zone by gravity, where they are collected and periodically removed
Data Source
Figure 1~2
AI summary
The invention relates to a device for separating feed material (6) into fines (29) and coarses (30) with a cylindrical viewing zone (24) arranged along an axis (8), and with a distribution channel (9) for supplying viewing air (15) which extends over the circumference of the cylindrical viewing zone (24). The viewing zone (24) and the distribution channel (9) are separated from each other by a wall (12) which has openings (23) for the entry of viewing air (15) into the viewing zone (24). Furthermore, the device has a feed inlet (4) which connects axially to the cylindrical viewing zone (24) for feeding the device with feed material (6), a coarse discharge (26) which connects axially to the viewing zone (24) opposite the feed inlet (4), and a fines discharge (5) for removing the fines (29) from the viewing zone (24).To standardize the entry velocity of the viewing air into the viewing zone, it is proposed according to the invention that the flow cross-section of the distribution channel (9) decreases in the flow direction (15).