Sander Centrifugal Fan Guide Wall Geometry
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Solution Overview
Problem
Conventional sanders face inefficiencies in dust collection due to high dust suction resistance, which reduces their operational time and increases energy consumption.
Innovation Solution
The design incorporates a centrifugal fan with a specific geometry and an airflow element that generates a dust removal airflow, guided by a housing with strategically positioned guide walls and an increasing distance from the central axis, reducing suction resistance and enhancing dust collection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional dust collection system is used in the sander, then the structure is simple, but the dust suction resistance is high which reduces dust collection efficiency
Solution Approach 1:
The patent applies local quality by creating a guide wall with specific geometric characteristics (distance from central axis between 40-60mm, gradual increase along rotation direction) at a localized position in the dust collection system. This localized geometric optimization creates a spiral airflow path that reduces suction resistance and improves dust collection efficiency without requiring complete redesign of the entire system.
Solution Approach 2:
The patent changes geometric parameters of the airflow guide structure, specifically setting the distance from the guide wall to the central axis between 40-60mm and configuring the guide wall to gradually increase in distance along the preset rotation direction. These parameter optimizations create favorable airflow conditions that reduce dust suction resistance and improve collection efficiency.
2Duration of action of moving object
If the sander operates for extended periods, then productivity increases, but energy consumption increases and operational time is limited
Solution Approach 1:
The patent ensures continuous and efficient dust collection throughout the operational period by optimizing the airflow guide structure. The guide wall configuration maintains stable spiral airflow from the dust inlet through the collection chamber to the outlet, ensuring continuous effective operation without energy waste, thereby extending usable operational time.
Solution Approach 2:
The patent converts the potentially harmful effect of high dust suction resistance into a beneficial spiral airflow pattern. By strategically positioning the guide wall at specific distances from the central axis, the resistance that would normally be detrimental is transformed into a controlled airflow guide that improves dust collection efficiency and reduces energy consumption.
3Volume of moving object
If the guide wall is positioned closer to the central axis, then the structure is more compact, but the dust suction resistance increases
Solution Approach 1:
The patent optimizes the parameter of guide wall positioning by setting the distance from the central axis between 40-60mm, which balances compactness with suction performance. The guide wall is configured to gradually increase in distance from the central axis along the rotation direction, creating an expanding spiral flow path that maintains compact overall dimensions while ensuring sufficient dust suction capability.
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 improves dust suction performance, extends the operational time of the sander, and reduces energy consumption by optimizing airflow and dust collection efficiency.
Implementation Method 1
an airflow element rotatable about a central axis along a preset direction of rotation to generate a dust removal airflow
Data Source
AI summary
A sander includes an airflow element rotatable about a central axis along a preset direction of rotation to generate a dust removal airflow; an electric motor for providing a power source for the airflow element; and a battery pack for providing an energy source for the electric motor. When the sander is in a load-free state, the working duration of the sander when the battery pack consumes 10 WH of energy is defined as the functional time T of the sander; and the product of the load-free rotational speed N of the electric motor and the functional time T of the sander is greater than or equal to 63000 rpm·min and less than or equal to 120000 rpm·min.