Dust Collection Box With Reverse-Air Filter Cleaning
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Solution Overview
Problem
Existing dust extractors for hammer drills require manual cleaning of filters, which is inconvenient and increases the frequency of filter access, as the filters often become blocked during operation.
Innovation Solution
A dust extractor design that allows for air flow to be directed back through the filter in reverse, enabling automatic cleaning during operation by separating the filter into two parts and using a rotatable air guide valve to connect the air intermediate chamber to either the air outlet chamber or ambient air aperture, facilitating debris removal from the filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual cleaning of the filter is used, then the filter can be cleaned, but the frequency of filter access increases and it is inconvenient
Solution Approach 1:
The system enables self-service cleaning by using the existing air suction device to automatically reverse-flow air through the filter, cleaning it without requiring manual intervention or disassembly. The control system automatically switches the air flow direction to clean the filter during operation.
Solution Approach 2:
The filter cleaning is performed periodically during the operation of the dust extractor. The control system switches the air flow direction between normal operation mode and filter cleaning mode at predetermined intervals, enabling continuous operation without stopping for manual cleaning.
2Ease of operation
If the filter is made removable for cleaning, then access is provided, but the device complexity increases
Solution Approach 1:
Instead of making the filter removable, the system keeps the filter fixed and provides automated cleaning through reverse air flow. This eliminates the need for complex removable mounting structures while achieving the same cleaning objective through a different mechanism.
Solution Approach 2:
The mechanical approach of making the filter removable and accessible is replaced with a pneumatic approach using reverse air flow to clean the filter in place. This substitution eliminates mechanical complexity while maintaining cleaning effectiveness.
3Productivity
If continuous operation without filter cleaning is used, then productivity is maintained, but the filter becomes blocked and efficiency decreases
Solution Approach 1:
The system maintains continuous useful action by periodically interrupting normal operation to perform filter cleaning. The control system switches between dust collection mode and filter cleaning mode, ensuring the filter remains efficient without requiring prolonged shutdowns, thus maintaining overall productivity while preserving filter performance.
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 reduces the need for frequent manual filter cleaning by allowing for continuous cleaning during operation, maintaining the filter's efficiency and extending its usage time.
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
directing an air flow back through at least part of the filter in the reverse direction
Data Source
AI summary
A dust collection box for a dust extractor includes first and second air inlet chambers, an air inlet aperture through which air is drawn into the first air inlet chamber, an air outlet aperture through which air is dawn out of the second air outlet chamber, an air intermediate chamber formed in the housing, and a filter mounted within the housing. The filter includes a first part through which air passes from the air inlet chamber to the air outlet chamber, and a second part through which air passes from the air inlet chamber to the air intermediate chamber. An ambient air aperture is formed in the wall of the housing. A valve disposed proximate the ambient air aperture is switchable to connect the air intermediate chamber to only one of the air outlet chamber or the ambient air aperture.