Flat-Back Dust Extractor With Reversing Airflow Filter Cleaning
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Solution Overview
Problem
Existing dust extractors for power tools like hammer drills suffer from filter blockages that require manual cleaning, and existing industrial vacuum cleaners with flush back systems cannot be directly applied due to the lack of a separate suction force when reversing air flow.
Innovation Solution
A dust extractor design with a single air flow path that allows for reversing the air flow through the filter during a backflush operation, using a mechanism to control the direction of air flow, ensuring the filter is cleaned automatically without losing suction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual cleaning of the filter is implemented, then the filter can be cleaned, but the operation time and productivity are reduced due to frequent manual intervention
Solution Approach 1:
The system performs self-cleaning of the filter through automatic backflush operation. The vacuum source reverses air flow through the filter to remove accumulated dust, eliminating the need for manual cleaning intervention and maintaining continuous productivity during dust collection operations
2Extent of automation
If industrial vacuum cleaner with flush back is used, then automatic filter cleaning is achieved, but the system cannot generate suction force when reversing air flow
Solution Approach 1:
The system dynamically changes the direction of air flow through the filter while maintaining the same vacuum source. The vacuum source can reverse the air flow direction to perform backflush cleaning, and the housing design with open sides allows bidirectional flow without compromising the vacuum source's ability to generate sufficient suction force in either direction
3Object-affected harmful factors
If the housing is enclosed to contain dust, then dust containment is improved, but automatic filter cleaning becomes difficult
Solution Approach 1:
The housing is segmented with open sides rather than being fully enclosed. This segmentation allows the air flow to access the filter from multiple directions, enabling automatic backflush cleaning while still containing dust effectively during normal operation. The open sides create pathways for reversed air flow to reach the filter for cleaning purposes
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 cleans the filter automatically, reducing the frequency of manual cleaning and maintaining efficient dust collection performance.
Implementation Method 1
The air passes through the filter assembly, whilst the dust is trapped by the filter within the dust collection box
Implementation Method 2
During a back flush operation, the vacuum source blows air and entrained debris through the single air flow path towards the shroud. The air passes through the filter assembly to remove the entrained debris in either direction.
Data Source
AI summary
A dust extractor for a drill is provided, including a single air flow path, a shroud having an internal chamber for collecting dust in fluid communication with a first end of the single air flow path, a filter assembly located in the single air flow path, a vacuum source connected to a second end of the single air flow path, and an air flow control mechanism controlling a direction of air flow generated by the vacuum source. During a normal operation, the vacuum source draws air and entrained debris from the internal chamber of the shroud through the single air flow path. During a back flush operation, the vacuum source blows air and entrained debris through the single air flow path towards the shroud. The air passes through the filter assembly to remove the entrained debris in either direction.