Power Tool Dust Collector Filter Guide Unit Design
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Solution Overview
Problem
Dust collection devices for power tools, such as electric drills and hammer drills, suffer from filter clogging when used at an angle, leading to reduced efficiency and frequent filter cleaning or replacement.
Innovation Solution
A dust collection device design featuring a filter positioned to cover the outlet on an inner wall face of the dust box, with a guide unit that includes a partitioning wall and air outlets to direct airflow around the filter, preventing direct dust contact and promoting efficient dust collection and extended filter life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the filter is positioned to face upward when the power tool points upward, then dust collection is effective, but dust accumulates on the filter surface causing clogging
Solution Approach 1:
The patent introduces a flow-around space that extends continuously around the periphery of the filter, creating a three-dimensional airflow path that surrounds the filter rather than just approaching it from one direction. This dimensional change allows dust-laden air to flow around the filter in multiple directions, preventing dust accumulation on the filter surface while maintaining effective dust collection.
Solution Approach 2:
The partitioning wall acts as an intermediary element that guides airflow from the inlet toward the flow-around space, preventing direct flow of dust-laden air onto the filter surface. This intermediary structure mediates between the inlet and the filter, redirecting the airflow to achieve both effective dust collection and prevention of filter clogging.
2Productivity
If air flows directly onto the filter surface, then dust is captured effectively, but the filter clogs requiring frequent cleaning
Solution Approach 1:
The patent creates a flow-around space that预先 (in advance) redirects airflow away from direct contact with the filter surface. By establishing this flow pattern before dust can accumulate on the filter, the system prevents clogging proactively rather than requiring reactive cleaning. The partitioning wall and flow-around space configuration preliminarily guide the airflow to achieve both dust capture and reduced maintenance.
3Reliability
If the filter covers the outlet on the inner wall face with projection into the dust box, then dust contact is reduced, but airflow guidance is needed
Solution Approach 1:
The patent segments the dust box interior into distinct functional zones: the flow-around space that surrounds the filter, the space between the filter and inner wall face, and the inlet region. This segmentation is achieved through the partitioning wall that divides these spaces, creating a structured airflow path that protects the filter while maintaining manageable device complexity through clear spatial organization.
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 design effectively suppresses filter clogging, ensuring suitable dust collection efficiency and longer device life by preventing direct dust contact with the filter and dissipating airflow energy, even when the tool is used at an angle.
Implementation Method 1
a guide unit is provided to guides air, which flows in through the inlet, to the space
Implementation Method 2
a separator (dust box) is detachably accommodated in the housing. The separator is provided with a first opening section upstream and a second opening section downstream in the airflow direction, such that a folded-type filter that partitions the first and second openings from each other is disposed in the interior of the housing
Implementation Method 3
Dust that flows into the separator alongside with air is captured by the filter as a result, and stored in the separator
Data Source
AI summary
In a dust collection device attached to a hammer drill, a filter is provided in a dust box at a position at which the filter covers an outlet provided on a rear face of a lid body, in a state such that a filter surface projects into the dust box from the rear face of the lid body. A space is formed between an inner face of a box main body and a side face of the filter that is adjacent to the filter surface. Air outlets are provided to guide air, which flows in through an inlet, toward the space.