Dual-Layer Vacuum Filter Bag for Fine Construction Dust
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Solution Overview
Problem
Vacuum cleaners used in construction sites face rapid clogging and reduced suction performance when collecting fine brick or plaster dust, as existing filters become saturated and blocked, leading to short collection periods and safety concerns during dust disposal.
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
1Reliability
If a fine filter is used to collect fine brick or plaster dust, then dust retention is improved, but the filter rapidly becomes blocked and suction performance deteriorates
Solution Approach 1:
The filter is divided into two distinct layers: a coarse upstream layer and a fine downstream layer. The coarse layer captures large dust particles first, preventing them from shock-loading the fine layer. This segmentation allows the fine filter to maintain its dust retention capability while extending the overall filter life and suction performance duration.
Solution Approach 2:
Different regions of the filter have different properties tailored to their specific functions. The upstream region uses coarse material with high permeability for initial dust capture, while the downstream region uses fine material for precise dust retention. This local quality differentiation optimizes both dust retention and extends productivity by preventing premature clogging.
2Productivity
If a thick coarse filter layer is used to extend collection time, then productivity is improved, but the fine filter may still become fouled prematurely
Solution Approach 1:
The coarse upstream layer performs preliminary dust capture action before the air stream reaches the fine filter. By capturing large particles and dust in advance, the coarse layer protects the fine filter from premature fouling, allowing the fine filter to maintain its reliability over an extended collection period.
Solution Approach 2:
The coarse filter layer acts as an intermediary between the dust-laden air stream and the fine filter. It mediates the interaction by capturing particles that would otherwise directly foul the fine filter, thereby extending productivity while preserving the fine filter's reliability.
3Device complexity
If a multilayer filter with low thickness is used, then device complexity is reduced, but the filter becomes rapidly saturated with dust in construction applications
Solution Approach 1:
The filter uses a composite structure combining coarse and fine filter materials in a two-layer configuration. This composite approach provides both structural simplicity and enhanced dust collection capacity, allowing the filter to handle large quantities of construction dust without becoming rapidly saturated, while maintaining manageable device complexity.
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 enables continuous collection of large amounts of brick and plaster dust for extended periods, significantly improving suction performance and reducing the need for frequent bag replacements, while ensuring safe dust disposal without releasing dust into the air.
Implementation Method 1
the coarse filter means comprises a relatively coarse filter material having a thickness, preferably of at least 4 mm. The coarse filter may provide a matrix volume in which dust may be accumulated so as to prevent early fouling of the fine filter.
Implementation Method 2
the coarse filter means comprises a relatively coarse filter material having a thickness, preferably of at least 4 mm. The coarse filter may provide a matrix volume in which dust may be accumulated
Implementation Method 3
the fine filtration means serves to provide a fine filter for retaining dust particles
Implementation Method 4
both being adapted to be placed in a suction-induced air stream
Data Source
AI summary
The disclosure relates to the field of vacuum cleaning and in particular the collection of air-entrained debris, in a filter bag. The filter bag is for use in vacuum cleaning apparatus, and comprises fine planar filtration means in the form of a collection bag 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 4 mm which provides a matrix volume in which dust may be collected. 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.