Dust Collection Container Air Guide Deflection Geometry
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Solution Overview
Problem
Existing dust collection containers for hand-held power tools face challenges in preventing dust from clogging filters and re-entering the tool, with inefficient air flow management leading to reduced dust collection capacity and potential filter damage.
Innovation Solution
A dust collection container design featuring a flow-optimized deflection geometry in the air guiding element that minimizes flow velocity changes and directs dust-laden air streams directly onto a pleated filter, combined with a sealing mechanism allowing for easy lid removal and dust chamber emptying, preventing dust re-entry into the tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional air guide element is used downstream of the dust inlet opening, then dust-laden airflow may be directed towards the filter element, but flow reversal and turbulence occur causing dust to buildup on the filter element and potentially clog it
Solution Approach 1:
The air guide element is designed with a specific deflection geometry that changes the flow parameters (direction and velocity distribution) of the dust-laden airflow. The geometry is optimized to deflect air at angles that prevent flow reversal while maintaining sufficient velocity to carry dust particles away from the filter element surface, thus preventing dust buildup and clogging.
2Quantity of substance
If the dust collection chamber is designed to maximize dust collection volume, then more dust can be collected, but the container becomes heavier and more difficult to handle
Solution Approach 1:
The container is designed with a dust collection chamber that concentrates the collection volume in the most effective location - directly beneath the filter element where dust settles naturally. The chamber geometry is optimized locally to maximize dust accumulation capacity in this critical zone without unnecessarily increasing the overall container volume or weight, achieving efficient dust collection with minimal additional mass.
3Reliability
If the lid is designed to seal dust-tight with the container base, then dust cannot escape, but the lid becomes difficult to remove for emptying the dust collection chamber
Solution Approach 1:
The connection between lid and container base transitions from a static permanent seal to a dynamic removable connection. The lid incorporates engagement elements that provide a secure sealed connection during operation, but can be easily disengaged when needed for emptying. This dynamic design allows the sealing function to be activated during use and deactivated during maintenance without compromising either function.
4Productivity
If the air guide element directs airflow strongly towards the filter element, then dust collection efficiency improves, but flow velocity increases causing dust to be stirred up and potentially re-enter the power tool
Solution Approach 1:
The air guide element geometry is designed to optimize flow velocity distribution - maintaining high velocity in the central region to efficiently carry dust particles toward the filter for collection, while creating lower velocity zones near the container walls and outlet area where dust particles can settle. This parameter optimization ensures high dust collection efficiency while preventing dust from being stirred up and re-entering the power tool.
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 prevents dust clogging on the filter, maximizes dust collection capacity, and ensures dust does not re-enter the tool after it's switched off, enhancing the overall efficiency and usability of the container.
Implementation Method 1
the dust-laden airflow entering through the dust inlet opening is deflected towards the filter element with minimal change in flow velocity and without flow reversal
Implementation Method 2
The underside of the lid is covered with a filter element designed as a pleated filter made of special paper
Implementation Method 3
a sealing element is located between the circumferential upper edge of the container base and the precisely circumferential lower edge of the hood-shaped lid
Implementation Method 4
The latch, designed in the manner of a toggle latch, allows for controlled opening and closing of the lid and, after opening, easy separation of the lid and housing
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a dust collection container for a hand power tool, comprising a bottom container part (11) having a floor (111) and front and side walls (112, 113) and a dust inlet opening (24) disposed in a front wall (112), and a cover closing the bottom container part (11) in a dust-tight manner and having a plurality of air discharge holes (20) and a filter element (21) disposed on the bottom side of the cover (12). In order to deflect the dust-laden airflow flowing through the air inlet opening toward the filter element (21) without reversing the flow, an air guide element (27) having a flow-optimized deflection geometry is disposed in the bottom container part (11) downstream from the dust inlet opening (24) in the dust inlet direction. The deflection geometry is configured so that the inlet cross-section of the air flow (28) determined by the shape of the dust inlet opening (24) is transformed into a discharge cross-section adapted to the shape of the impingement surface of the filter element (21).