Vacuum Cleaner Elbow Geometry to Prevent Airflow Clogs
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Solution Overview
Problem
Domestic air treatment apparatuses, such as vacuum cleaners, often experience clogs or blockages due to the redirection of airflow and constriction in bends within the fluid flow path, particularly in elbows where the cross-sectional area is less than the inlet, leading to inefficiencies and the need for clean-out ports.
Innovation Solution
Designing a fluid flow path with a bend that maintains a cross-sectional area of at least the same as the inlet, minimizing clogs by ensuring all portions of the path have a consistent or greater diameter, and optionally constructing the bend from two parts with a movable or removable outer side for easy cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the fluid flow path includes a bend with reduced cross-sectional area (constriction), then the apparatus can be more compact, but blockages or clogs occur within the bend
Solution Approach 1:
The patent changes the geometric parameter of the bend by maintaining a constant cross-sectional area throughout the bend portion, rather than reducing it. This parameter change eliminates the constriction that causes blockages while still achieving the desired flow redirection, thereby maintaining reliability without sacrificing compactness
2Reliability
If the fluid flow path includes a bend with constant cross-sectional area, then blockages are reduced, but the apparatus occupies more space
Solution Approach 1:
The patent employs a curved bend design with smooth transitions and optimized curvature radius. By carefully designing the bend geometry with appropriate curvature, the apparatus achieves efficient flow redirection with constant cross-sectional area, minimizing the space occupied while preventing blockages
3Ease of operation
If a clean out port is provided adjacent the elbow, then blockages can be cleared, but the device complexity increases
Solution Approach 1:
The patent extracts or removes the need for clean-out ports by designing the bend to be inherently blockage-resistant through constant cross-sectional area. This eliminates the additional structural complexity of clean-out ports while maintaining the ability to clear blockages through the main flow path
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 design reduces, prevents, or minimizes blockages within the bend, eliminating the need for clean-out ports and maintaining airflow efficiency by maintaining a consistent cross-sectional area throughout the bend, thereby enhancing the performance of domestic air treatment apparatuses.
Implementation Method 1
a suction motor to draw air through the fluid flow path
Data Source
AI summary
A domestic air treatment apparatus such as a vacuum cleaner comprises a fluid flow path including a dirt inlet and a clean air outlet. A suction motor and a treatment member are provided in the flow path. The fluid flow path comprises a portion that has a bend, such as an elbow, wherein all portions of the fluid flow path through the bend have a cross sectional area that is at least about the same as a cross sectional area of the inlet.