Passive Fan Airflow Arrangement for Power Tool Particle Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional power tools face damage due to particulate material entering the internal mechanisms, as existing precleaners require a single motor to drive both the cooling fan and the precleaning fan, increasing power requirements and inefficiency.
Innovation Solution
A power tool airflow arrangement featuring a passive fan in the particle dispersion assembly, driven by intake air, which separates particulates from the airstream without mechanical connection to the motor, reducing power requirements and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single motor drives both the cooling fan and the precleaning fan, then the power tool can perform both cooling and particle separation functions, but the power requirements increase and efficiency decreases
Solution Approach 1:
The patent divides the single motor system into two separate drive systems: an active fan mechanically driven by the motor assembly, and a passive fan that operates independently using airflow-driven rotation. This segmentation allows each fan to be optimized for its specific function without sharing mechanical drive components, thereby reducing overall power consumption while maintaining dual functionality.
Solution Approach 2:
The passive fan is designed to be self-driven by the airflow it encounters during normal operation. The intake air stream flowing through the housing naturally rotates the passive fan blades, enabling the precleaning function without requiring additional motor power. This self-service mechanism eliminates the need for a second motor while maintaining particle separation capability.
2Device complexity
If a single motor drives both fans, then the device structure is simplified, but the power requirements and heat generation increase
Solution Approach 1:
The drive system is segmented into mechanical drive (motor + active fan) and airflow-driven rotation (passive fan). This segmentation reduces the power burden on the motor while maintaining both cooling and precleaning functions, thereby reducing power requirements and heat generation without significantly increasing structural complexity.
3Use of energy by moving object
If the passive fan is used for particle separation, then power consumption is reduced, but the fan must be driven by airflow which may reduce cleaning effectiveness
Solution Approach 1:
The passive fan utilizes pneumatic principles by allowing the airflow itself to drive the fan blades. The rotating passive fan creates centrifugal force and airflow patterns that effectively separate particulates from the air stream. This pneumatic drive mechanism maintains particle separation effectiveness while eliminating the need for additional motor 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
Effectively reduces particulate material in the airflow upstream of the motor, preventing damage and optimizing power tool performance by utilizing the airflow to drive the passive fan, thereby reducing power consumption and improving tool reliability.
Implementation Method 1
The passive fan is not mechanically driven by the motor assembly (although it could be); instead, it is driven by intake air flowing through the particle dispersion assembly
Implementation Method 2
The particulate dispersion assembly is further configured to redirect the intake airstream from a first direction to a second direction within the tool housing
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
The present invention is directed to an airflow generation and particle dispersion arrangement for a power tool (e.g., an angle grinder). The arrangement includes a motor, an airflow generation assembly, and a particle dispersion assembly. The airflow generation assembly includes a fan driven by the motor. When engaged, the driven fan generates an airstream that is drawn through the power tool. The particle dispersion assembly includes a passive fan that is not driven by the motor, but instead is driven by the airstream. In operation, the passive fan generates centrifugal and mechanical forces sufficient to remove particles from intake air passing through the particle dispersion assembly.