Openable Two-Stage Cyclone Assembly for Reduced Filter Maintenance
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Solution Overview
Problem
Cyclone assemblies for surface cleaning apparatuses face challenges in effectively removing particulate matter, leading to clogging of pre-motor filters and increased maintenance requirements due to incomplete particulate removal by single cyclonic cleaning stages.
Innovation Solution
A cyclone assembly with a first and second cyclonic cleaning stage, where the second stage has a greater number of cyclone chambers and taller cyclone chambers than the first stage, optimized for reduced backpressure and enhanced particulate removal, allowing for equal airflow velocities and increased centrifugal force to dis-entrain smaller particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pre-motor filter is provided downstream of the first cyclonic cleaning stage to protect the suction motor, then the suction motor is protected from particulate matter, but the filter becomes clogged with particulate matter requiring user cleaning and replacement
Solution Approach 1:
The patent removes the pre-motor filter component from the system by implementing a second cyclonic cleaning stage that adequately protects the motor through centrifugal separation, eliminating the need for filter maintenance while preserving motor protection functionality
Solution Approach 2:
The cyclonic cleaning stages automatically separate and remove particulate matter from the airflow through centrifugal force, providing self-service protection for the suction motor without requiring user intervention for filter cleaning or replacement
2Device complexity
If a single cyclonic cleaning stage is used, then the device complexity is reduced, but particulate matter removal effectiveness is insufficient leading to filter clogging
Solution Approach 1:
The patent divides the cyclonic cleaning function into two distinct stages: a first cyclonic cleaning stage with larger cyclone chambers for initial particulate removal, and a second cyclonic cleaning stage with smaller cyclone chambers for fine particulate removal, thereby improving overall effectiveness while maintaining manageable complexity
Solution Approach 2:
The patent applies different cyclone chamber dimensions and configurations to different stages: the first stage uses larger chambers optimized for bulk particulate removal, while the second stage uses smaller chambers optimized for fine particulate removal, matching each local structure to its specific functional requirement
3Reliability
If the second cyclonic cleaning stage has a greater number of cyclone chambers, then particulate matter removal effectiveness is improved, but backpressure increases
Solution Approach 1:
The patent extends the cyclone chambers in the longitudinal dimension to increase their height and volume, allowing multiple cyclone chambers to be arranged in parallel while maintaining adequate flow capacity and minimizing backpressure increases despite the increased number of chambers in the second stage
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 significantly reduces the need for pre-motor filters by effectively removing all or most dirt entrained in the air exiting the first cyclonic cleaning stage, thereby simplifying maintenance and improving the overall efficiency of the surface cleaning apparatus.
Implementation Method 1
if a second stage cyclone chamber has a smaller radius than the first stage cyclone chamber, particles entrained in the airflow in the second stage cyclone will experience a greater centrifugal force than they experienced in the first stage cyclone, which may promote the dis-entrainment of smaller particles from the airflow in the second cyclonic cleaning stage
Implementation Method 2
Surface cleaning apparatus that use one or more cyclonic cleaning stages to remove particulate matter (e.g. dust and dirt) from an airstream are known
Data Source
AI summary
A cyclone assembly for a surface cleaning apparatus has an openable lower end, a first cyclonic cleaning stage, a second cyclonic cleaning stage, and an airflow passage from the first cyclonic cleaning stage to the second cyclonic cleaning stage. The lower end is moveable to an open position in which at least a portion of the air flow passage is opened.