Layered Vacuum Filter Bag for Fine Dust Clogging Control
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Solution Overview
Problem
Vacuum cleaners used in construction sites struggle to collect fine brick or plaster dust without rapid clogging of filters, leading to reduced suction performance and increased health risks due to dust contamination.
Innovation Solution
A filter bag design featuring a coarse, thick filtration layer upstream of a fine filtration layer, where the coarse layer provides a matrix for dust accumulation, preventing early fouling of the fine filter and allowing extended suction performance by immobilizing dust before it reaches the fine filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fine filter is used to collect fine brick or plaster dust, then dust collection efficiency is improved, but the filter rapidly becomes clogged and suction performance deteriorates
Solution Approach 1:
The filter system is segmented into multiple layers with different pore sizes. The fine filter layer (0.5-5 micrometres) is positioned downstream while coarse filter layers (50-200 micrometres) are positioned upstream. This segmentation allows each layer to perform its specific function: the coarse layers capture larger particles first, preventing them from reaching and clogging the fine filter, thereby extending the operational duration while maintaining dust collection efficiency.
Solution Approach 2:
Different regions of the filter system are assigned different local qualities in terms of pore size and filtration capability. The upstream regions have coarse pores suitable for capturing larger dust particles, while the downstream region has fine pores for capturing fine dust particles. This local differentiation optimizes the overall system by preventing fine filter clogging while maintaining high dust collection efficiency.
2Duration of action of moving object
If a coarse filter is used to prevent filter clogging, then suction performance duration is improved, but fine dust particles pass through without being captured
Solution Approach 1:
The filter system is divided into multiple functional segments: upstream coarse filter layers for capturing larger particles and extending filter life, and a downstream fine filter layer for capturing fine dust particles. This segmentation ensures both extended suction performance duration and maintained dust collection efficiency for fine particles.
Solution Approach 2:
The coarse filter layers act as intermediary elements between the dust-laden air stream and the fine filter. They intercept and capture larger particles first, serving as a protective barrier that prevents these particles from reaching and clogging the fine filter, thereby extending operational duration while allowing the fine filter to continue capturing fine dust particles effectively.
3Quantity of substance
If a thick multi-layer filter is used to collect large quantities of dust, then dust collection capacity is improved, but the filter thickness increases and airflow resistance increases
Solution Approach 1:
The filter system is segmented into multiple layers with progressively finer pore sizes, where each layer captures particles within its size range. This segmentation allows the system to achieve high dust collection capacity by capturing particles at different stages, rather than requiring a single thick filter that would create excessive airflow resistance.
Solution Approach 2:
Different layers of the filter have different local qualities in terms of pore size and thickness optimized for their specific function. The upstream coarse layers have larger pores and can be thicker without creating excessive resistance, while the downstream fine layer has smaller pores but is thinner. This local optimization allows high dust collection capacity while minimizing overall airflow resistance.
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 filter bag significantly enhances dust collection capacity and maintains suction performance for longer periods, reducing the need for frequent bag replacements and minimizing dust release during emptying, thus improving operational efficiency and safety.
Implementation Method 1
the coarse filter provides a matrix volume in which dust may be accumulated so as to prevent early fouling of the fine filter
Implementation Method 2
fine planar filtration means and coarse planar filtration means both being adapted to be placed in a suction-induced air stream
Data Source
Figure 1~2
Figure 3
Figure 4A~4C
AI summary
The invention relates to the field of vacuum cleaning and in particular the collection of air-entrained debris, for example in a filter bag. The invention is a filter for use in vacuum cleaning apparatus, which comprises fine planar filtration means and coarse planar filtration means both being adapted to be placed in a suction- induced air stream with the coarse filtration means disposed upstream of the fine filtration means, wherein the fine filtration means serves to provide a fine filter for retaining dust particles and wherein the coarse filtration means comprises a relatively coarse filter material having a thickness of at least 4mm which provides a matrix volume in which dust may be collected. The fine planar filtration means may be a filter web arranged in the form of a collection bag. The volume occupied by the coarse filtration means comprises at least 2 %, preferably at least 5 %, most preferably at least 10 % of the maximum internal volume defined by the collection bag. The filter provides significantly enhanced fine dust collection capability, particularly for the grinding of brick or plasterwork where large amounts of fine ceramic dust are continuously generated and which tends to foul and degrade conventional filters.