Dust Removal Duct Cross-Section and Rotation Alignment
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Solution Overview
Problem
The flow behavior of suction air in hand-held power tools is not optimal, particularly at the inlet opening of the dust removal connection, leading to suboptimal dust removal efficiency, especially in areas far from the inlet.
Innovation Solution
The dust removal duct is designed with a cross-section that increases in size further from the inlet opening, and the direction of tool rotation aligns with the air flow direction, enhancing suction power. Additionally, features like spiral ducts, air entrainment devices, and permeable seals improve airflow and dust extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dust removal duct has a constant cross-section, then the structure is simple, but the suction effect is insufficient in areas far from the inlet opening
Solution Approach 1:
The dust removal duct's cross-sectional area is varied along its length, increasing from the inlet opening toward the tool working area. This parameter change optimizes the suction effect by maintaining appropriate flow velocity while expanding the effective dust capture volume, thereby improving dust removal efficiency without requiring complex additional components
2Power
If the tool rotation direction is opposite to the air flow direction, then the tool structure is simpler, but the suction power is reduced
Solution Approach 1:
The rotational direction of the tool is changed to match the air flow direction in the dust removal duct. This parameter change creates a synergistic effect where the tool rotation reinforces the suction flow, generating additional centrifugal force that enhances dust particle separation and improves overall suction power
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 configuration ensures optimal suction and dust removal efficiency across the tool space, including areas far from the inlet, by aligning flow directions and increasing cross-sectional area, resulting in improved dust extraction performance.
Implementation Method 1
the flow cross section is smaller at a greater distance from the inlet opening of the dust discharge connection... the flow cross section can increase in stages... the flow cross section increases essentially continuously
Implementation Method 2
A direction of rotation of the tool for machining the work object and a direction of flow of the air in the dust removal duct advantageously correspond. The direction of rotation and the direction of flow run in the same direction, for example. As a result, a flow intensification or even flow generation is achieved.
Implementation Method 3
The dust removal duct expediently runs spirally, i.e. it has a spiral shape. For example, the dust removal channel runs around a work spindle on which the tool is arranged.
Data Source
Figure 1a~1b
Figure 2a~2c
Figure 3a~3b
AI summary
The hand machine tool (10) has a tool holder rotary operated by a driving motor (13) for a machining side for abrasive or cutting work object machining with a tool and a cover plate (25) with a tool area for supporting the tool for partial covering of the tool. A dust removal channel is guided to an inlet of a dust removal connection. The dust removal channel is formed between the tool and a wall of the tool area.