Rotating Suction Chamber for Air Separation
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Solution Overview
Problem
Existing air separation devices in recyclable processing plants face issues such as jamming, reduced separation efficiency due to lack of dwell time, sensitivity to material orientation, and inability to handle wet or sticky materials, leading to improper sorting and reduced throughput.
Innovation Solution
A rotating suction chamber with an inclined cylindrical drum and a closed-loop air circulation system, where a suction hood lifts light fractions vertically and a blower creates airflow to separate materials, allowing multiple sorting opportunities and preventing bridging, while helical flights within the drum aid in separating light and heavy fractions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a suction chamber with chutes or plates is used to contain airflow, then separation is achieved, but material bridging and clogging occur causing downtime
Solution Approach 1:
The patent applies the dynamics principle by replacing static chutes and plates with a rotating drum that continuously moves and agitates material. The rotation prevents material from settling and bridging in fixed positions, while the inclined flights dynamically lift and drop material to maintain separation effectiveness without clogging.
Solution Approach 2:
The rotating drum with inclined flights creates mechanical agitation and vibration as material is continuously lifted and dropped. This mechanical motion prevents material from settling into bridging configurations that would clog static chambers, maintaining continuous operation.
2Loss of energy
If the cross-sectional area of the separation chamber is reduced, then airflow is contained, but large items cause bridging and throughput is reduced
Solution Approach 1:
The patent transitions from a two-dimensional planar chamber to a three-dimensional rotating drum with inclined flights. This dimensional change allows material to be lifted and dropped through the air stream in a continuous cycle, preventing bridging by large items while maintaining effective airflow containment within the drum's volume.
Solution Approach 2:
The rotating drum dynamically processes material through continuous lifting and dropping cycles, preventing large items from establishing stable bridges that would block throughput. The dynamic motion maintains both energy efficiency and high productivity.
3Ease of operation
If an air knife is used to push light components forward, then jamming is reduced, but separation efficiency decreases due to single opportunity separation
Solution Approach 1:
The rotating drum provides continuous separation action as material is repeatedly lifted and dropped through the air stream throughout the rotation cycle. This continuous multi-stage separation process maintains high efficiency while the rotating motion prevents jamming by keeping material in constant motion.
Solution Approach 2:
The periodic lifting and dropping of material by the inclined flights creates multiple separation opportunities during each rotation cycle. This periodic action maintains separation efficiency while preventing jamming through continuous material motion.
4Use of energy by moving object
If a thin knife of air is used for separation, then energy consumption is reduced, but wet or sticky materials clump together and cannot be separated
Solution Approach 1:
The rotating drum with inclined flights provides mechanical agitation that breaks apart wet or sticky material clumps before they enter the air stream. This mechanical vibration and agitation, combined with the air flow, enables separation of materials that would otherwise clump together, while maintaining reasonable energy consumption.
5Productivity
If material is introduced in the middle part of a rotating drum, then separation occurs, but light fraction sticks to or wraps around heavy fraction causing improper sorting
Solution Approach 1:
The patent introduces material at the upper end of the inclined drum where the air stream is strongest and the material trajectory is optimized. This localized introduction point ensures light fraction is immediately carried upward by the air flow before it can stick to or wrap around heavy fraction, maintaining sorting accuracy while keeping the system productive.
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 prevents jamming, increases separation efficiency by providing multiple sorting opportunities, effectively handles surges and wet materials, and achieves true specific gravity separation, enhancing throughput and reducing emissions by containing air and particulates within the system.
Implementation Method 1
a blower is used to generate a knife of air that pushes the light components forward while the heavy components (e.g. glass) fall through
Implementation Method 2
a separator based on the ratio of weight to cross sectional area of the item perpendicular to the air flow
Implementation Method 3
a suction chamber, where material is dropped through a flow of air produced by a vacuum
Data Source
AI summary
A rotating suction chamber apparatus for sorting a mixture of materials comprises a cylindrical drum with its upper end is at a higher elevation than its lower end. An upper housing connected to the upper end has a material intake for receiving the mixture of materials for introduction to the upper end. The mixture of materials includes a light fraction and a heavy fraction, and the upper housing has an outlet for the light fraction. A suction hood connected to the light fraction outlet includes a light separator shaft with a substantially vertical portion, and an air blower is adapted to create an airflow from the lower end, to the upper end, through the light fraction outlet and through the suction hood. A rotator rotates the drum about its longitudinal axis so that the heavy fraction is moved through the drum and falls out of the lower end.