Surface Cleaning Apparatus with Impact Wall for Filter Clog Prevention
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Solution Overview
Problem
Existing surface cleaning apparatuses face inefficiencies in separating large debris, such as hair and fibers, from air streams due to direct flow paths that allow these materials to reach and clog porous filters, leading to reduced performance and increased backpressure.
Innovation Solution
Incorporating an air treatment chamber with an impact wall that creates a recirculating flow, directing air to gather large debris before it reaches the porous filter, and using a pleated filter member with a treatment volume optimized for minimal backpressure, allowing for efficient separation and filtration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a direct air flow path is used through the air treatment chamber, then the apparatus structure is simple and compact, but large debris reaches and clogs the porous filter, reducing performance and increasing backpressure
Solution Approach 1:
The air treatment chamber is segmented into distinct functional zones: a momentum separation zone with impact wall for large debris, and a filtration zone with porous filter for fine particles. This segmentation allows each zone to perform its specific function optimally without interfering with the other, preventing filter clogging while maintaining structural organization.
Solution Approach 2:
The impact wall acts as an intermediary element between the air inlet and the porous filter. It intercepts and redirects large debris particles before they reach the filter, serving as a protective mediator that preserves filter performance without requiring direct contact between debris and filter media.
2Reliability
If the porous filter area is increased to improve filtration, then filtration performance improves, but backpressure increases
Solution Approach 1:
The momentum separation zone performs preliminary action by removing large debris particles from the air stream before the air reaches the porous filter. This pre-cleaning action reduces the loading on the filter, allowing it to maintain high filtration performance with smaller filter area, thereby reducing backpressure.
Solution Approach 2:
Different regions of the air treatment system are assigned different functional qualities: the momentum separation zone handles large particle removal with direct airflow, while the filtration zone handles fine particle removal with filtered airflow. This local differentiation optimizes overall system performance without requiring uniform increases in filter area.
3Reliability
If an impact wall is added to create recirculating flow, then large debris separation improves, but the chamber requires more space
Solution Approach 1:
The impact wall utilizes the vertical dimension by extending downward from the top wall of the chamber, creating recirculating flow patterns that utilize vertical space rather than requiring additional horizontal footprint. This dimensional approach allows effective debris separation within a compact chamber volume.
Solution Approach 2:
The recirculating flow pattern created by the impact wall utilizes curved airflow paths that guide air and debris in circular motions, maximizing the use of available chamber space and enhancing separation efficiency without requiring linear expansion of the chamber dimensions.
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 effectively prevents large debris from reaching the porous filter, enhancing the apparatus's performance by maintaining airflow and reducing clogging, while also minimizing backpressure through optimized design and filtration area.
Implementation Method 1
An impact wall, which faces the air inlet, is configured to inhibit incoming air passing directly through the air treatment chamber to the air outlet... A wall portion causes a change the direction of air flow in the air treatment chamber. This change in flow causes a recirculating flow
Implementation Method 2
a porous filter member (e.g., a screen or filter media)... The porous filter member is downstream of the impact wall
Implementation Method 3
a suction motor configured to generate a vacuum
Data Source
AI summary
A surface cleaning apparatus having an air flow path; a suction motor positioned in the air flow path; an air treatment chamber provided in the air flow path; and a porous filter provided in the air treatment chamber and including an outlet passage from the air treatment chamber. An air impermeable impact wall in the air treatment chamber is opposed to an inlet into the air treatment chamber. At least a portion of the impact wall or a deflecting portion of a wall defining part of the front end of the air treatment chamber imparts a circular flow to air entering the air treatment chamber.