Drill Dust Extractor Backflush Filtration With Single Air Path
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Solution Overview
Problem
Existing dust extractors for hammer drills typically have a single filter that becomes blocked during operation, requiring manual cleaning, whereas industrial vacuums with automatic flush-back systems use multiple filters in parallel to facilitate self-cleaning, which is not applicable to dust extractors with a single filter in series.
Innovation Solution
The dust extractor employs a single air flow path with a filter assembly and an air flow control mechanism to reverse the air flow direction through the filter during the backflush operation, allowing for automatic cleaning by blowing air and debris back through the filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single filter is used in a dust extractor, then the device complexity is reduced, but the filter becomes blocked requiring manual cleaning which reduces productivity
Solution Approach 1:
The patent applies reverse airflow to clean the filter by directing air from the collection chamber back through the filter in the opposite direction of normal operation. This inversion of airflow direction dislodges and removes accumulated dust from the filter media, enabling automatic cleaning without manual intervention while maintaining a single filter configuration.
Solution Approach 2:
The dust extractor performs self-cleaning of its filter through the backflush mechanism. The system uses its own vacuum source to generate reverse airflow that automatically removes dust from the filter during operation or between cycles, eliminating the need for external manual cleaning and maintaining continuous operational productivity.
2Ease of operation
If manual filter cleaning is required, then ease of operation is maintained, but loss of time increases due to frequent maintenance interruptions
Solution Approach 1:
The system automatically cleans its own filter using the backflush mechanism, eliminating the need for operator intervention. The vacuum source reverses airflow through the filter to remove accumulated dust, allowing the filter to be cleaned during operation or between cycles without requiring the operator to stop work for maintenance.
Solution Approach 2:
The backflush operation can be performed periodically during dust extractor use or between cycles. This periodic reverse airflow cleaning maintains filter performance over time without requiring continuous manual attention, reducing overall maintenance time while keeping the system easy to operate.
3Ease of operation
If the filter is made removable for cleaning, then ease of operation is improved, but device complexity increases
Solution Approach 1:
Instead of making the filter removable for manual cleaning, the system implements self-cleaning through backflush. The filter remains permanently installed in the dust collection chamber, and the vacuum source periodically reverses airflow to clean it automatically. This approach maintains filter accessibility for cleaning while avoiding the structural complexity of removable filter designs.
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
This solution enables automatic filter cleaning during operation, reducing the frequency of manual filter maintenance and maintaining dust extractor performance by ensuring continuous airflow and debris removal.
Implementation Method 1
a vacuum source to draw air and debris through the filter assembly
Implementation Method 2
During a back flush operation, the vacuum source blows air and 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.