Headgear Air Purifier with Microphone-Based Wind Direction Control
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Solution Overview
Problem
Air purification headgear devices struggle to maintain a stream of purified air directed at the wearer's mouth and nose when worn outdoors due to wind interference, as wind can push the purified air away.
Innovation Solution
The headgear incorporates two microphones and a control unit that analyze signals to determine wind direction and magnitude, adjusting the air purifier flow rates to counteract wind, ensuring the purified air stream is effectively targeted at the wearer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stream of purified air is directed towards the mouth and nose of the wearer, then air purification effectiveness is improved, but wind may push the stream away from the target area
Solution Approach 1:
The air purifier dynamically adjusts its air flow rate based on detected wind conditions. The control unit receives wind information from the wind indicator and modifies the air flow rate accordingly, allowing the system to adapt to changing environmental conditions and maintain effective air delivery to the wearer's respiratory area
Solution Approach 2:
The system uses a wind indicator to detect wind conditions and provides feedback to the control unit, which then adjusts the air purifier's operation. This feedback loop enables the system to respond to external wind disturbances and maintain reliable air purification effectiveness
2Stability of the object's composition
If the flow rate of the air purifier is increased to counteract crosswind, then the stream direction stability is improved, but energy consumption increases
Solution Approach 1:
The air purifier dynamically adjusts its air flow rate based on detected wind conditions. The control unit receives wind information from the wind indicator and modifies the air flow rate accordingly, allowing the system to adapt to changing environmental conditions and maintain effective air delivery to the wearer's respiratory area
Solution Approach 2:
The system changes the air flow rate parameter in response to wind conditions. By adjusting this key parameter based on wind indicator feedback, the system maintains stream direction stability while optimizing energy consumption rather than operating at constant high power
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
This solution provides a cost-effective and reliable method to maintain the direction and intensity of purified air at the wearer's mouth and nose by dynamically adjusting air purifier flow rates in response to wind conditions, enhancing air delivery efficiency across various wind scenarios.
Implementation Method 1
Microphones typically sense air disturbances in the range of hundreds of μPa up to tens of Pa. However, even relatively weak wind can generate pressures that a hundred times greater than this.
Data Source
AI summary
A headgear is described that includes a first air purifier, a second air purifier, a first microphone, a second microphone, and a control unit. The control unit analyses a first signal output by the first microphone and a second signal output by the second microphone to determine a direction of wind. The control unit then controls the relative flow rates of the first air purifier and the second air purifier in response to the determined direction of wind.