UVC Reflective Chamber for Sterilization Mask
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Solution Overview
Problem
Portable air sterilization devices face challenges in efficiently sterilizing both inhaled and exhaled air due to high power requirements, which limits their practicality and effectiveness in reducing airborne disease transmission.
Innovation Solution
A UVC reflective chamber with a reflective liner, combined with particle filtration and airflow management using a fan and heat sink, along with sonic agitation and adjustable UVC intensity based on breathing patterns, to enhance sterilization efficiency while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sterilization of both incoming and outgoing air is implemented, then the effectiveness of preventing airborne disease transmission is improved, but the power requirements increase
Solution Approach 1:
The reflective chamber maintains continuous circulation of UVC photons throughout the air processing system, ensuring that both incoming and outgoing air streams are exposed to sterilizing radiation without interruption, thereby achieving comprehensive protection while optimizing energy utilization
Solution Approach 2:
The reflective chamber acts as an intermediary component that captures and redirects UVC photons, ensuring they effectively treat both inhalation and exhalation air streams. This mediator approach maximizes the sterilization effectiveness of the UVC source while minimizing the power required to achieve the desired level of protection
2Ease of operation
If a fan is used to create positive air pressure to overcome filter resistance, then user comfort is improved, but device complexity increases
Solution Approach 1:
The system utilizes the user's own exhaled breath as the driving force for airflow. The exhalation pressure naturally pushes air through the filters and reflective chamber, eliminating the need for an active fan or motor while maintaining user comfort and reducing device complexity
Solution Approach 2:
The design leverages pneumatic principles by using the pressure differential created during user exhalation to drive air flow through the system. This passive pneumatic approach replaces mechanical fan components, simplifying the device while ensuring adequate airflow and user comfort
3Reliability
If UVC light quantity is increased to improve sterilization, then sterilization effectiveness is improved, but power consumption increases
Solution Approach 1:
The reflective chamber ensures continuous circulation and reuse of UVC photons throughout the air processing system. Rather than requiring high-intensity continuous emission, the system maintains effective sterilization through prolonged photon exposure achieved by reflective recycling, thereby reducing overall power consumption while maintaining sterilization effectiveness
Solution Approach 2:
Instead of allowing UVC photons to be absorbed and wasted, the reflective chamber recovers and redirects them back into the air stream. This recovery mechanism extends the useful life of each photon, reducing the total energy input required to achieve the desired 6-log reduction in microbial load
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 achieves a 6-log reduction in microbes with reduced power usage, improved user comfort through positive air pressure, and effective communication via sound transmission, making portable air sterilization devices more practical and efficient.
Implementation Method 1
The reflective chamber is made reflective using a UVC internal reflective surface. This surface is preferably formed from ePTFE, or other equivalently UVC reflective material. The use of ePTFE is ideal because it is 95% reflective in the frequency of UVC light.
Implementation Method 2
With the UVC light providing sterilization, the remaining requirement for air cleaning is particle filtration. Sterilization is defined as a 6-log reduction (99.9999%) of various microbes including viruses, bacteria, and spores.
Implementation Method 3
The solution is to create positive air pressure, compensating for the resistance of the filter. Thus, a fan that runs at a consistent speed will at times provides too much air, and too little at other times.
Implementation Method 4
Thus, a mechanical solution is ideal. In particular, discharging the fan through a perforated baffle. The holes, or perforations, in the baffle allow excess air to exit the system, or additional air to be drawn in.
Implementation Method 5
As an alternative to a fan, the device may use the flow of warm air from the heatsink to create negative pressure at the air outlet. This helps to draw air out, thus helping the user to overcome the resistance of the filters.
Implementation Method 6
to further increase the effectiveness of UVC light sterilization, sonic agitation is optionally added to prevent shadowing. Shadowing occurs when a particle in the airstream shields, or blocks, particles that are behind it, or in its shadow.
Implementation Method 7
While filtration is important, it creates resistance to airflow. For example, pre-filters for large dust particles and aerosols. Air may also be filtered through stainless-steel cup filters that remove larger particles.
Data Source
AI summary
The sterilization mask with UVC reflective chamber includes a chamber with reflective liner, through which inhaled and exhaled air passes. The reflective chamber is also referred to as a sterilization chamber. Using a reflective chamber ensures each photon of UVC light has a long life, thus dissipating slowly. Increasing the life of the UVC photons decreases the quantity of photons that must be created. Thus, less power is required to achieve the sterilization. Sterilization is defined as a 6-log reduction (99.9999%) of various microbes including viruses, bacteria, and spores. The reflective chamber is made reflective using an UVC internal reflective surface. This surface is preferably formed from ePTFE, or other equivalently UVC reflective material.