Pleated Vacuum Cleaner Filter Bag for Low Pressure Drop
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Solution Overview
Problem
Vacuum cleaner filter bags with high filtration efficiency experience a significant reduction in suction power as they fill with dust, due to the decrease in volume flow of air, which is exacerbated by the stiffness of the filter material limiting its ability to unfold and provide sufficient volume for dust retention.
Innovation Solution
The introduction of surface foldings on the filter bag walls, which increase the airflow area by folding the filter material, allowing for a greater filter area and reducing pressure drop, thereby maintaining suction power even as the bag fills with dust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the filter material is made stiff to maintain structural integrity, then the bag maintains its shape, but the bag cannot unfold sufficiently to provide enough volume for dust retention
Solution Approach 1:
The filter bag is divided into multiple folded sections or pleats, creating a segmented structure that can compress into a small form factor while expanding to provide large dust retention volume when deployed
Solution Approach 2:
The filter bag employs a nested or collapsed configuration when not in use, similar to an accordion or bellows structure, allowing it to be stored in a compact state while providing sufficient volume during operation
2Quantity of substance
If the filter area is increased to improve filtration capacity, then more dust can be retained, but the pressure drop increases and suction power decreases
Solution Approach 1:
The filter media is configured in three-dimensional folded or pleated structures, transforming a two-dimensional filter surface into a multi-dimensional configuration that increases effective filter area within the same footprint while optimizing airflow pathways to minimize pressure drop
3Reliability
If the filter bag is designed to completely close to prevent dust leakage, then sealing performance improves, but manufacturing complexity increases
Solution Approach 1:
The filter bag design integrates the sealing function directly into the bag structure itself through continuous welding or bonding of the filter media edges, eliminating the need for separate sealing components or complex closure mechanisms while maintaining complete dust containment
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 increased airflow area extends the filter's service life, improves particle separation, and allows for a more efficient conversion of motor input into vacuum flow, enabling the use of lower power motors while maintaining cleaning effectiveness.
Implementation Method 1
reducing pressure drop, thereby maintaining suction power
Implementation Method 2
the filter material of the first and of the second bag wall is made of a nonwoven
Data Source
AI summary
The invention relates to a vacuum cleaner filter bag comprising a first bag wall (104) comprising a filter material and a second bag wall also comprising a filter material and a base (103). The first and the second bag wall are joined to the base along one part of the periphery thereof and are joined together along the remaining part of the periphery. The connection between the first bag wall, the second bag wall and the base is formed such that the vacuum cleaner filter bag is completely closed. The filter material of the first and the second bag walls is made of non-woven material. Said vacuum cleaner filter bag comprises an opening (102) through which the air which is to be filtered can pass through into the vacuum cleaner filter bag, and a retaining plate. Said vacuum cleaner filter bag is characterised in that the first and/or the second bag wall comprises at least five folds (101).