Active Ventilation Mask for Pressure Stability
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Solution Overview
Problem
Conventional masks, both passive and active, suffer from pressure fluctuations and differential issues that lead to discomfort, reduced effectiveness, and potential cross-contamination due to the need for a tight fit and inherent pressure changes during breathing.
Innovation Solution
A mask with active ventilation that includes an actuable inlet and outlet with conditioners, a pressure sensor, and a controller to maintain a set pressure within the mask, either equal to, greater than, or less than the outside environment, using variable speed fans and potentially dampers to regulate airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tight fit is used to ensure mask effectiveness, then protection effectiveness is improved, but comfort deteriorates due to pressure fluctuations and differential issues
Solution Approach 1:
The mask incorporates an active ventilation system with variable speed fans that dynamically adjust airflow to compensate for pressure changes during breathing. This dynamic adjustment maintains a stable pressure environment inside the mask, eliminating the discomfort associated with tight static seals while preserving protection effectiveness.
Solution Approach 2:
The system uses pressure sensors to continuously monitor the pressure differential between the inside and outside of the mask. This feedback is processed by a controller that adjusts fan speed to maintain the desired pressure relationship, ensuring both comfort and effectiveness are achieved simultaneously.
2Ease of operation
If active ventilation is added to maintain pressure, then comfort is improved, but device complexity increases
Solution Approach 1:
The ventilation system is designed to perform multiple functions: it provides active airflow to maintain comfort, regulates pressure differentials to prevent leakage, and can be adjusted for different usage scenarios. This multi-functionality justifies the added complexity by consolidating multiple protective and comfort features into a single integrated system.
Solution Approach 2:
The system changes the operational parameters of the ventilation system, specifically using variable speed fans controlled by frequency signals. This allows the mask to adapt to different breathing patterns and environmental conditions, providing comfort while managing the complexity through intelligent control rather than mechanical complexity.
3Reliability
If pressure differential is maintained between mask and environment, then protection effectiveness is improved, but cross-contamination risk increases
Solution Approach 1:
The mask maintains a dynamic pressure balance where the pressure differential is actively regulated to remain substantially equal between the inside and outside environments. This dynamic equilibrium prevents the pressure-driven leakage that causes cross-contamination while preserving the effectiveness of the mask through controlled airflow and filtration.
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 provides a comfortable fit by maintaining consistent pressure within the mask, reduces cross-contamination by minimizing pressure differentials, and enhances the mask's effectiveness by ensuring fresh air flow across the wearer's face.
Implementation Method 1
A pressure sensor is arranged to measure the pressure within the air channel. The pressure sensor is configured to produce a pressure stream indicative of a pressure within the air channel.
Implementation Method 2
The actuable inlet or actuable outlet include a variable speed fan. In order to maintain pressure, the controller is further configured to regulate a speed of the variable speed fan. The speed of the variable speed fan is controlled by a frequency signal sent to the variable speed fan by the controller.
Implementation Method 3
The first conditioner or the second conditioner includes a filter element.
Data Source
AI summary
A covering creates an air channel around a face of an entity wearing the covering. An actuable inlet includes a first conditioner. The actuable inlet regulates fluid exchange between the air channel and an outside environment. An actuable outlet includes a second conditioner. The actuable outlet regulates fluid exchange between the air channel and an outside environment. An air pressure within the air channel can be maintained at a specified level.