Protective Helmet Ventilation Guide Members
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Solution Overview
Problem
Existing protective helmets, particularly for motorcycling, face challenges in achieving effective ventilation and demisting of the visor chamber due to turbulence and interference between air flows, leading to inefficient air circulation and potential misting issues.
Innovation Solution
The helmet employs physically separate ventilation paths and guiding members to isolate air flows intended for demisting and general ventilation, ensuring independent air circulation and minimizing turbulence, with guiding members creating a closed cross-section to direct air flows effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple air ports and channels are used for ventilation, then air circulation coverage is improved, but air flow control deteriorates leading to turbulence and chaotic flows
Solution Approach 1:
The ventilation system is divided into multiple independent circuits, each with its own dedicated air ports and channels. The first circuit handles general ventilation while the second circuit handles demisting, preventing interference between different air flow functions and maintaining laminar flow patterns.
Solution Approach 2:
Guide members are introduced as intermediary structures to direct and control air flows within each circuit. These guide members ensure that air follows predetermined paths from air ports through channels to exit ports, preventing chaotic mixing and maintaining controlled laminar flow.
2Productivity
If air ports and channels are used for ventilation, then ventilation coverage is improved, but flow independence deteriorates causing interference between demisting and general ventilation flows
Solution Approach 1:
The ventilation system is segmented into functionally independent circuits. The first circuit is dedicated to general ventilation with its own air ports and channels, while the second circuit is dedicated to demisting with separate air ports, channels, and guide members, ensuring complete flow independence.
Solution Approach 2:
Different regions of the helmet are assigned different ventilation qualities and functions. The first circuit serves general ventilation needs in non-visor areas, while the second circuit provides specialized demisting function in the visor chamber, with each circuit optimized for its specific purpose.
3Device complexity
If shared air channels are used, then device complexity is reduced, but ventilation efficiency deteriorates due to turbulence and head losses
Solution Approach 1:
The ventilation system uses separate channels for different functions. The first circuit has dedicated channels for general ventilation, while the second circuit has dedicated channels for demisting, eliminating turbulence from mixed flows and improving overall ventilation efficiency despite increased structural complexity.
Solution Approach 2:
Guide members act as intermediaries within the second circuit to ensure smooth, controlled air flow from air ports through the visor chamber to exit ports. These guide members maintain laminar flow patterns that reduce head losses and improve demisting 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
This solution enhances ventilation efficiency and reduces turbulence, ensuring optimal air circulation and demisting within the helmet, maintaining clear visibility and comfort for the rider.
Implementation Method 1
guiding members which place an area of the helmet in fluid communication with a ventilation port for output of the air
Implementation Method 2
these prevent a regular flow of air from the visor chamber towards the outlet ventilation port, with the risk of a head loss in the flows
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A protective helmet (1) is described, said helmet comprising one or more air guiding members (20) configured to place in fluid communication at least one area of the helmet (22) with one or more ventilation ports (6) for output/expulsion of air so as to define an area intended for the passage of air flow independent from, and/or isolated, and/or not in fluid communication with, other areas intended for the passage of air flows in the helmet.