Drill Dust Extractor Back Flush for Filter Clogging
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Solution Overview
Problem
Existing dust extractors for power tools, such as hammer drills, often have filters that become blocked during operation, requiring manual cleaning, whereas an automated back flush mechanism would reduce the frequency of filter access and improve operational efficiency.
Innovation Solution
A dust extractor design that includes a single filter with a fan-driven back flush mechanism, where the air flow is redirected in reverse through the filter to clean it, using a solenoid or electric motor-controlled mechanism, and optionally sensors to trigger the back flush based on usage or filter clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is used in the dust extractor to trap dust, then dust collection effectiveness is improved, but the filter becomes blocked during operation requiring manual cleaning
Solution Approach 1:
The dust extractor performs self-maintenance by using its own vacuum fan to generate reverse air flow that automatically cleans the filter. The system uses itself (the fan and air flow mechanism already present in the dust extractor) to perform the cleaning function, eliminating the need for external manual intervention and transforming the maintenance task into an automated self-service operation.
2Ease of operation
If manual filter cleaning is required, then access to the filter must be provided or the filter must be removable, but this increases device complexity and reduces operational efficiency
Solution Approach 1:
The dust extractor automatically cleans its own filter using the vacuum fan and reverse air flow mechanism, eliminating the need for manual access, removal, or cleaning interfaces. This self-service approach removes the entire filter access subsystem, thereby reducing device complexity while maintaining ease of operation.
3Reliability
If the air suction device draws air through the filter during operation, then dust is trapped effectively, but the filter clogs and performance degrades over time
Solution Approach 1:
The dust extractor implements periodic reverse air flow cycles during operation to continuously clean the filter. Instead of continuous forward flow that progressively clogs the filter, the system periodically reverses the air flow direction to blow dust off the filter media, maintaining consistent filtering performance throughout operation and preventing productivity degradation.
Solution Approach 2:
The reverse air flow cleaning mechanism operates continuously or near-continuously during dust extractor operation, ensuring the filter remains clean at all times rather than degrading between manual cleanings. This continuous maintenance action sustains optimal dust trapping efficiency and productivity throughout the operational period.
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 back flush mechanism effectively cleans the filter automatically during operation, reducing manual intervention and maintaining dust extractor performance by preventing filter clogging, thus enhancing operational efficiency and safety.
Implementation Method 1
The air suction device draws the air together with dust from within shroud, through the telescopic arm into the dust collection box
Implementation Method 2
The air passes then through the filter, whilst the dust is trapped by the filter within the dust collection box
Implementation Method 3
The vacuum source can be used to direct the air flow in reverse direction through the filter to clean the filter
Data Source
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AI summary
A dust extractor for a drill comprising a housing; a single air flow path formed within the housing; a shroud connected to the housing, the shroud comprising an internal chamber for collecting dust generated by the cutting of a work piece, the chamber being in fluid communication with one end of the single air flow path; at least one filter assembly located in the single air flow path through which any air flowing through the single air flow path in either direction must pass; a vacuum source connected to the other second end of the single air flow path, the vacuum source being capable drawing air from the internal chamber of the shroud into and along the single air flow path towards the vacuum source, the air passing through the filter as it passes through the single air flow path; characterised in that there is further provided an air flow control mechanism which controls the direction of air flow generated by the vacuum source in the single air flow path enabling either the air to flow in a first direction along the single air flow path from the shroud through the single air flow path towards the vacuum source during the normal operation of the dust extractor or the air to flow in a second direction along the single air flow path from the vacuum source through the single air flow path towards the shroud during back flush; wherein, when the air is flowing in the first direction along the single air flow path, the vacuum source draws air and any entrained debris from the internal chamber of the shroud into and along the single air flow path, the air passing through the filter and continuing towards the vacuum source, any debris being caught by the filter as the air passes through it; and wherein, when the air is flowing in the second direction along the single air flow path, the vacuum source blows air along the single air flow path towards the shroud, the air passing through the filter in the reverse direction, the air removing any debris caught on the filter and blowing it along the single air flow path towards the shroud.