Slanted-Fin Filter Design for Handheld Power Tool Dust Removal
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Solution Overview
Problem
Existing dust removal systems for handheld power tools often require frequent filter replacements due to clogging, which is inefficient and increases maintenance costs.
Innovation Solution
A dust removal system with a filter featuring slanted fins to reduce dust adhesion, a compact cuboidal structure to minimize pressure losses, and a flexible frame to optimize airflow, allowing for effective dust separation and reduced maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter is designed with conventional parallel fins, then dust separation is effective, but dust adhesion to fins increases causing frequent clogging and filter replacement
Solution Approach 1:
The filter fins are designed with an asymmetric slanted configuration where adjacent fins are inclined at different angles relative to the airflow direction. This asymmetric arrangement prevents dust particles from adhering to the fin surfaces by ensuring that dust is continuously directed toward the collecting container rather than settling on the fins, thereby reducing clogging and extending filter service life.
Solution Approach 2:
Instead of having fins that are parallel to the airflow direction (conventional design), the invention inverts the approach by slanting the fins at varying angles. This inversion of the conventional parallel fin design creates a surface configuration that actively repels dust adhesion through geometric redirection, transforming the fin surface from a dust-collecting structure to a dust-repelling structure.
2Productivity
If the filter housing is designed with non-cuboidal shape to optimize airflow, then dust separation efficiency improves, but pressure losses increase requiring larger motors
Solution Approach 1:
The filter housing is designed with a cuboidal overall shape to minimize pressure losses, while local variations in the fin geometry and airflow channels provide the necessary turbulence and separation efficiency. This local optimization of airflow characteristics within the constrained cuboidal housing allows effective dust separation without the energy penalties associated with non-cuboidal housing shapes.
3Object-generated harmful factors
If the fins are slanted at large angles (>10°) to reduce dust adhesion, then dust repulsion improves, but device volume and performance increase
Solution Approach 1:
The invention optimizes the fin slant angles to fall within a specific range (3° to 10°) rather than using extreme angles. This parameter optimization achieves effective dust repulsion while minimizing the volume required for the filter housing. The specific angle range represents a balance between dust repulsion effectiveness and compact device dimensions.
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 system effectively captures dust with reduced adhesion to filter fins, maintaining performance and extending filter life, while minimizing space and energy requirements for handheld devices.
Implementation Method 1
The slant of the fins reduces the adhesion of the dust to the fins
Implementation Method 2
The fan has to build up a pressure differential of several mbars relative to the suction nozzle
Data Source
AI summary
A dust removal system handheld power tool includes a fan (18) to generate an air flow (19), a suction nozzle (27) to capture dust-laden air from a tool (4), and a collecting container (22) to collect the dust. The collecting container (22) has a suction opening (27) connected to the suction nozzle (27) as well as an exhaust opening (28) connected to the fan (18). A filter (29) serves to separate dust into the collecting container (22) and is arranged so as to cover the exhaust opening (28). The filter (29) has several consecutive fins (18) arranged one beside the other in a direction (y) that is perpendicular to the direction (z) of the air flow (19). The fins (18) are slanted with respect to each other. The slant (42) of the fins (44) reduces the adhesion of the dust to the fins (44).