Cyclone Shroud Structure for Fine and Bulky Dirt Separation
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Solution Overview
Problem
Current surface cleaning apparatus with cyclonic stages face inefficiencies in separating varied particle sizes and densities, as existing designs often struggle to effectively disentangle fine and bulky materials from airflow.
Innovation Solution
A cyclone and shroud construction where the cyclone has a tangential air inlet and a perforated shroud with airflow passages, allowing air to travel through the shroud and further filtration, enhancing separation efficiency by guiding air and particulate matter through a unidirectional flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a traditional cyclone design is used, then the structure is simple, but the separation efficiency for varied particle sizes and densities is insufficient
Solution Approach 1:
The cyclone is divided into distinct functional segments: a cyclone chamber for initial separation, a shroud with perforations for secondary separation, and a dirt collection chamber. Each segment handles specific particle sizes and densities, with the shroud's multiple perforations creating staged separation zones that improve overall separation efficiency without requiring a completely complex redesign
Solution Approach 2:
The shroud is nested within the cyclone chamber, with the shroud's perforated surface creating internal flow paths within the existing cyclone structure. The dirt collection chamber surrounds both the cyclone chamber and shroud, creating a compact nested arrangement that enhances separation capability without proportionally increasing external dimensions
2Ease of operation
If a shroud with perpendicular openings is used, then air guidance is improved, but the separation of fine and bulky materials becomes less effective
Solution Approach 1:
The shroud features non-uniform perforation distribution with different hole sizes and densities at different locations. The perforations are arranged to create specific flow patterns for different particle types: finer perforations for fine particles and larger openings for bulky materials, allowing localized optimization of separation for different material types while maintaining effective air guidance
Solution Approach 2:
The shroud introduces a radial dimension to the separation process by using perforations that redirect airflow from the tangential cyclone motion into axial flow. This dimensional transition creates additional separation opportunities as particles must navigate both the rotational cyclone path and the radial-perforation path, enhancing separation of varied particle sizes and densities
3Device complexity
If a unidirectional flow cyclone is used, then the airflow path is simplified, but the collection of diverse particulate matter becomes more challenging
Solution Approach 1:
The shroud acts as an intermediary element between the cyclone chamber and the dirt collection chamber. It mediates the transition of airflow from rotational to axial flow while simultaneously serving as a separation surface that captures particles of various sizes and densities. The perforated shroud structure allows it to handle diverse particulate matter while maintaining the simplicity of the unidirectional overall airflow path from inlet to outlet
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 configuration provides reliable separation efficiency for diverse particle sizes and densities, ensuring effective collection of dirt while allowing treated air to proceed to additional filtration stages.
Implementation Method 1
The air is drawn into the vacuum cleaner through a dirty air inlet and conveyed to a cyclone inlet. The rotation of the air in the cyclone results in some of the particulate matter in the airflow stream being disentrained from the airflow stream.
Implementation Method 2
The rotation of the air in the cyclone results in some of the particulate matter in the airflow stream being disentrained from the airflow stream. This material is then collected in a dirt collection chamber
Implementation Method 3
The treated air travels inwardly through holes in the shroud and longitudinally in the direction of the cyclone towards the air exit of the shroud. The air may then be subsequently treated in a further filtration step
Data Source
AI summary
A surface cleaning apparatus has a cyclone chamber and a dirt collection chamber exterior to the cyclone chamber. The cyclone chamber has an air inlet and an opposed end. The dirt outlet from the cyclone chamber comprises a gap at the terminal end of a cyclone chamber wall proximate the opposed end. A shroud extends inwardly into the cyclone chamber from the opposed end and is preferably tapered in the upstream direction.