Airflow Friction Materials for Static-Safe Power Tools
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Solution Overview
Problem
Power tools generate static electricity due to friction during operation, leading to potential system damage and user electrostatic shocks, particularly in airflow devices like blowers and blower vacuums.
Innovation Solution
The power tool incorporates a friction portion made of materials with different electrostatic properties, arranged in a specific sequence to neutralize static charges, and may include friction coatings or fan blades with varying electrostatic materials to balance charge flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fan blades and duct components are made of single material, then manufacturing is simple, but static electricity accumulates causing system damage
Solution Approach 1:
The patent applies composite materials by combining different materials with distinct electrostatic properties in the friction portion. Specifically, it uses a conductive material (such as metal or conductive polymer) combined with an insulating material (such as plastic or rubber) to create a composite structure that simultaneously manages static charge generation and dissipation, preventing static electricity accumulation while maintaining manufacturing feasibility
Solution Approach 2:
The patent applies local quality by making different portions of the friction component have different material properties. The friction portion is designed with a specific material composition (conductive + insulating materials) at the friction interface, while other parts of the component may use different materials, allowing targeted static electricity management at the critical friction area without requiring the entire component to be complex
2Object-affected harmful factors
If friction portion uses materials far apart in electrostatic sequence, then static charge neutralization is effective, but material selection becomes more complex
Solution Approach 1:
The patent combines materials with different electrostatic properties (conductive and insulating materials) in a composite structure where the conductive material dissipates charges and the insulating material prevents excessive charge generation, achieving effective static charge neutralization through the synergistic interaction of materials with complementary electrostatic characteristics
Solution Approach 2:
The patent changes the electrostatic parameters of the friction portion by selecting materials with specific electrostatic properties that are far apart in the electrostatic sequence. This parameter selection optimizes charge transfer and neutralization efficiency, creating an effective electrostatic balance that reduces static electricity accumulation
3Reliability
If friction portion is made of conductive material, then static charge dissipates well, but electrostatic shock to users increases
Solution Approach 1:
The patent uses a composite structure combining conductive and insulating materials where the conductive material provides charge dissipation pathways to prevent accumulation, while the insulating material acts as a barrier that controls the rate and manner of charge release, thereby preventing sudden electrostatic discharges that would shock users
Solution Approach 2:
The insulating material in the composite structure serves as an intermediary between the conductive charge-dissipating material and the user contact surface. This intermediary layer moderates the charge transfer process, allowing controlled dissipation while preventing direct electrostatic shock to users
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 effectively reduces static electricity generation to safe levels, preventing system damage and user shocks, ensuring normal operation and improved user experience.
Implementation Method 1
a friction portion capable of rubbing against a working object to generate static electricity
Implementation Method 2
the fan blades rub against the leaves etc. and generate the static electricity
Data Source
AI summary
A power tool includes a tool body. The tool body includes a friction portion capable of rubbing against a working object to generate static electricity during operation of the power tool. The friction portion is made of at least a first material and a second material; a position of the first material in an electrostatic sequence is located at one end of a position of the working object in the electrostatic sequence; and a position of the second material in the electrostatic sequence is located at the other end of the position of the working object in the electrostatic sequence.