Electret Module Air Purifier Sub-10 Micron Capture
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Solution Overview
Problem
Conventional air purifiers are ineffective in capturing smaller airborne particles less than 10 micrometers in diameter, which can cause significant health issues as they can penetrate deep into the lungs and bloodstream, while existing filters primarily target larger particles.
Innovation Solution
An air purifier using an electret module with a charged electret element and an adhesive layer, optionally integrated with a filter and headgear, that emits a static charge to capture small particles, and a static restorer to maintain or increase the electret's surface potential, enhancing its ability to capture airborne particles including pollen, bacteria, smoke, and viruses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional mesh filters are used to prevent inhalation of airborne particles, then large particles can be blocked, but small particles less than 10 micrometers cannot be effectively captured
Solution Approach 1:
The patent replaces the mechanical mesh filter system with an electret-based electrostatic capture system. The electret element generates an electric field that attracts and captures airborne particles through electrostatic forces, eliminating the need for fine mesh structures and enabling effective capture of sub-10-micrometer particles without mechanical filtration limitations.
Solution Approach 2:
The patent changes the fundamental capture mechanism from mechanical physical blocking to electrostatic field-based attraction. By introducing electrical charge parameters (electret surface potential, electric field strength) rather than relying solely on physical mesh dimensions, the system achieves high capture efficiency for fine particles that cannot be blocked by conventional filter geometries.
2Reliability
If the electret surface potential decays over time, then particle capture efficiency decreases, but restoring the potential requires additional energy and complexity
Solution Approach 1:
The patent implements a self-service mechanism where the electret module automatically restores its own surface potential through an integrated static restorer system. When the electret's charge decays, the restorer circuit detects the potential drop and automatically recharges the electret element, maintaining capture efficiency without requiring user intervention or complex external equipment.
Solution Approach 2:
The static restorer system incorporates feedback control to monitor the electret surface potential and activate restoration only when needed. This feedback mechanism prevents unnecessary energy consumption and extends the electret's operational life by maintaining optimal charge levels dynamically, balancing reliability with energy efficiency.
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 captures a wide range of airborne particles, including those less than 10 micrometers, by maintaining the electret's surface potential, thereby improving protection against harmful diseases and allergens, as demonstrated by the restoration of surface potential and improved particle capture efficiency.
Implementation Method 1
electrets are materials known to emit a quasi-permanent static charge
Implementation Method 2
The electret module emits an electret field that allows the purifier to capture airborne particles
Implementation Method 3
an adhesive layer coupled to the housing to capture airborne particles
Implementation Method 4
The static restorer includes a battery, a high voltage generator, a rectifier and a smoothing filter
Implementation Method 5
a high voltage generator, a rectifier and a smoothing filter
Data Source
AI summary
An air purifier having an electret module for capturing airborne particles, the electret module including an electret element disposed within a housing and an adhesive layer coupled to the housing to capture airborne particles, whereby the static field of the electret attracts the airborne particles, which subsequently adhere to the adhesive layer.