Multi-Disc Grinder Housing With Recessed Dust Extraction Ducts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hand-held power tools struggle with efficient dust extraction from multiple grinding wheels, leading to reduced airflow and increased pressure loss, which affects the tool's performance and user experience.
Innovation Solution
The design incorporates a housing part with recessed air ducts between grinding wheel receiving areas, allowing for low-loss air guidance and dust extraction. These air ducts are strategically positioned on the outer side of the housing, forming a guide structure that enhances airflow and reduces friction, enabling homogeneous dust extraction across all grinding wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple grinding wheels are driven simultaneously, then productivity is improved, but dust extraction efficiency deteriorates due to reduced airflow and increased pressure loss
Solution Approach 1:
The housing is divided into multiple independent air ducts, each serving a specific grinding wheel position. This segmentation allows each duct to maintain optimized airflow characteristics independent of other grinding operations, preventing the cumulative pressure loss that would occur in a shared exhaust system.
Solution Approach 2:
Air ducts are positioned on the outer lateral surface of the housing rather than routing exhaust through the interior. This spatial reconfiguration creates dedicated external pathways for each grinding wheel's dust extraction, eliminating internal airflow interference and maintaining consistent suction efficiency across all wheels.
2Productivity
If air ducts are positioned on the outer side of the housing, then dust extraction efficiency is improved, but device complexity increases
Solution Approach 1:
The air ducts are integrated directly into the housing's outer shell as recessed features rather than being separate attached components. This merging of the duct structure with the housing itself eliminates the need for additional fasteners, seals, or mounting mechanisms, reducing overall device complexity while maintaining extraction efficiency.
Solution Approach 2:
The housing structure serves dual functions: it provides mechanical protection for internal components and simultaneously acts as the air duct system for dust extraction. This multi-functionality eliminates the need for a separate duct system, simplifying the overall device architecture while achieving effective dust removal.
3Ease of operation
If recess depth increases from central region to edge, then homogeneous dust extraction is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The recess depth is varied locally across different regions of the housing - deeper at the edges and shallower at the center. This local quality variation compensates for the natural decrease in airflow velocity at the periphery, ensuring uniform dust extraction across the entire grinding surface without requiring excessively tight manufacturing tolerances throughout.
Solution Approach 2:
The recess depth parameter is systematically changed across the housing surface to optimize airflow distribution. By increasing depth from center to edge, the design compensates for geometric airflow losses and maintains consistent suction efficiency, achieving homogeneous dust extraction through controlled parameter variation rather than uniform 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 solution achieves improved air guidance and dust extraction efficiency, reducing pressure loss and allowing for more effective aspiration of sanding dust. This results in a more compact and user-friendly tool design, capable of reaching narrow or hard-to-reach areas.
Implementation Method 1
The air duct serves to guide the air, in particular the low-loss air guidance of an exhaust air stream
Implementation Method 2
The cross-section between the housing part and the sanding plate is enlarged. The concave structure of the recess additionally reduces the friction of the air stream on the housing part
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a hand-held power tool, in particular a grinder (10), for the simultaneous drive of several, preferably three, grinding discs (12, 14, 16), in particular tiltable, rotating and/or oscillating and/or randomly circularly driven, comprising at least one housing part (60) which has grinding disc receiving areas (102) and/or openings (100) in or through which grinding disc receptacles (56) and/or output shafts (40) for driving the grinding discs (12, 14, 16) are arranged. It is proposed that the at least one housing part (60) has a recess (108), in particular a concave recess (108), between at least two adjacent grinding disc receiving areas (102) and/or openings, wherein the recess (108) forms at least part of an air duct (120), in particular part of an air duct (120) for dust extraction.