Multi-Element Filter Housing Layout for Longer Vacuum Filter Life
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Solution Overview
Problem
Existing surface cleaning apparatuses face challenges in maximizing the upstream surface area of filters without increasing their volume, leading to reduced air flow efficiency and shorter filter life due to clogging and dirt penetration.
Innovation Solution
A surface cleaning apparatus with a filter assembly comprising multiple individual filter elements mounted on a common support, where the upstream faces of the filter elements provide a larger surface area than the porous filter media outlets, and an air impermeable material is used to define the outlets and prevent airflow bypass, enhancing dirt collection and filtration efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the upstream surface area of the filter is increased to improve dirt collection capacity, then the filter life is extended, but the volume of the filter assembly increases
Solution Approach 1:
The filter elements are arranged with their upstream faces oriented in multiple directions (front, rear, and sides) rather than a single plane, effectively utilizing three-dimensional space. This dimensional arrangement increases the total upstream surface area available for dirt collection without proportionally increasing the overall filter assembly volume, as the surface area is distributed across multiple faces of compactly arranged elements.
Solution Approach 2:
Multiple filter elements are nested or closely packed together within the filter housing, with each element contributing its upstream face surface area to the total filtration capacity. The elements are arranged to maximize space utilization, allowing the cumulative upstream surface area to exceed what would be achievable with a single large filter element of the same volume.
2Productivity
If multiple filter elements are arranged in parallel to increase upstream surface area, then filtration capacity is improved, but the device complexity increases
Solution Approach 1:
The filter assembly is segmented into multiple individual filter elements, each with its own upstream face, rather than using a single large filter. This segmentation allows the total upstream surface area to be distributed across multiple smaller elements arranged in parallel, increasing filtration capacity while maintaining a manageable structural complexity through modular design.
3Speed
If the filter elements are spaced apart to provide gaps for air flow, then air flow efficiency is improved, but the volume of the filter assembly increases
Solution Approach 1:
Gaps or spaces are provided locally between specific filter elements or at specific locations within the filter assembly where air flow channels are needed, rather than uniformly spacing all elements throughout the entire assembly. This localized gap provision maintains air flow efficiency while minimizing the overall volume increase, as the gaps are confined to specific functional areas rather than distributed throughout the entire filter structure.
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 design increases the upstream surface area for dirt collection, prolongs the filter's operational life by reducing clogging and dirt penetration, and allows for more air to be filtered before pressure drop occurs, enabling longer usage or equivalent performance with a smaller filter volume.
Implementation Method 1
each of the individual filter elements comprising porous filter material having at least one upstream face and at least one portion defining a porous filter media air outlet
Data Source
AI summary
A surface cleaning apparatus includes an air flow path, a filter housing, and a filter member in the filter housing. An air treatment member, a suction motor, and the filter housing are positioned in the air flow path. The filter member includes a plurality of individual filter elements arranged in parallel, each including porous filter material having at least one upstream face and at least one portion defining a porous filter media air outlet. The at least one upstream face has a larger surface area than the at least one portion. An outside gap is provided between at least some of the upstream faces and opposed facing walls of the filter housing, and an inside gap is provided between opposed upstream faces. A cross-sectional area of the outside gaps and the inside gaps is at least as large as a cross-sectional area of an air treatment member air inlet.