Breathing Apparatus Dynamic Fan Control for CO2 Removal
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Solution Overview
Problem
Existing breathing apparatuses, such as PAPRs, fail to respond to the immediate rate of change in a user's inhalation and exhalation, leading to potential carbon dioxide and associated gases not being completely pushed through the exit filter, which can result in their presence during the user's next intake of breath.
Innovation Solution
A breathing apparatus equipped with sensors that monitor breathing patterns, including air movement, humidity, carbon dioxide levels, and temperature, to adjust air intake and exhalation accordingly, ensuring that filtered air is provided during inhalation and exhaled air, including carbon dioxide, is effectively removed during exhalation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional PAPR systems are used, then basic air filtration is provided, but the system fails to respond to immediate rate of change in user's breathing pattern, causing carbon dioxide and associated gases to not be completely pushed through the exit filter
Solution Approach 1:
The PAPR system dynamically adjusts the fan speed based on real-time monitoring of the user's breathing pattern. The controller receives input from sensors that detect inhalation and exhalation rates, and automatically modulates the fan operation to match the user's instantaneous breathing needs, ensuring that exhaled air is always being pushed through the filter at an adequate rate.
Solution Approach 2:
The system incorporates sensors that continuously monitor the user's breathing pattern and provide feedback to the controller. This closed-loop feedback mechanism allows the controller to detect changes in breathing rate and adjust the fan speed accordingly, ensuring the system responds appropriately to the user's physiological state without requiring manual intervention.
2Reliability
If fan speed is increased to push exhaled air through the filter faster, then carbon dioxide removal is improved, but energy consumption increases
Solution Approach 1:
Rather than operating at constant high speed, the fan speed is dynamically adjusted to match the user's instantaneous breathing rate. During periods of normal or low breathing activity, the fan operates at lower speeds, conserving energy. When the user's breathing rate increases or during exhalation phases, the fan speed increases automatically to ensure adequate filtration, thus optimizing the balance between reliability and energy consumption.
Solution Approach 2:
The system changes the operational parameters of the fan based on detected breathing patterns. By monitoring variables such as inhalation/exhalation rate and adjusting fan speed accordingly, the system ensures that energy-intensive high-speed operation occurs only when necessary for effective carbon dioxide removal, rather than running at maximum capacity continuously.
Data Source
AI summary
A breathing apparatus and method adjusting air flow in a breathing apparatus are provided. The breathing apparatus comprises: a first face piece for directing a flow of air towards the user's mouth and nostrils; a second face piece for directing exhaled breath away from the user's mouth and nostrils; at least one sensor, coupled to the first or second face piece, for monitoring the user's breathing; a controller that adjusts the flow of air to the first face piece and the extraction of air exhaled by the user through the second face piece based on an output from the at least one sensor.