Safety Helmet With Infrared Reflective Cooling Structure
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Solution Overview
Problem
Existing safety helmets become uncomfortably warm in warm/hot weather due to infrared radiation transmission through their thermoplastic materials, increasing the user's head temperature.
Innovation Solution
Incorporation of an infrared reflective layer with a reflectivity of at least 40% and an evaporative cooling pad within the helmet to reflect and dissipate infrared radiation, reducing head temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermoplastic material is used for the outer shell, then protection and durability are improved, but temperature control deteriorates due to infrared radiation transmission
Solution Approach 1:
The patent applies a multi-layer composite structure consisting of an outer thermoplastic shell layer for protection and an inner infrared-reflective layer for thermal management. This composite construction allows the helmet to simultaneously achieve mechanical strength from the thermoplastic material and temperature control from the infrared-reflective layer that reflects solar radiation and reduces heat transfer to the user's head.
2Temperature
If infrared reflective layer is added, then temperature control is improved, but device complexity increases
Solution Approach 1:
The patent employs a thin-film infrared-reflective coating applied to the inner surface of the outer shell. This thin-film approach provides effective infrared reflection and thermal management without requiring thick or bulky materials, thereby minimizing the impact on helmet weight, volume, and overall structural complexity while achieving the desired temperature control.
3Temperature
If evaporative cooling pad is added, then cooling effect is improved, but weight increases
Solution Approach 1:
The patent utilizes an evaporative cooling pad containing porous material that absorbs and retains cooling liquid. The porous structure provides a large surface area for evaporation, enabling efficient cooling through phase change of the liquid. This approach delivers enhanced cooling performance while keeping the pad relatively lightweight compared to active mechanical cooling systems.
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 infrared reflective layer and evaporative cooling pad combination effectively reduces the internal helmet temperature, enhancing user comfort in warm conditions.
Implementation Method 1
an infrared reflective layer disposed in an interior of the outer shell. The infrared reflective layer may be configured for reflecting at a least a portion of incident infrared radiation transmitted through the outer shell
Implementation Method 2
an evaporative cooling pad positioned within a cavity defined by the inner surface of the outer shell. The evaporative cooling pad may include a liquid absorbing layer positioned within the cavity
Data Source
AI summary
A safety helmet includes an outer shell configured for surrounding a head of a user, and an infrared reflective layer disposed in an interior of the outer shell. The infrared reflective layer is configured for reflecting at a least a portion of incident infrared radiation transmitted through the outer shell. The infrared reflective layer has infrared reflectivity of at least 40%. The safety helmet further may have an evaporative cooling pad positioned within a cavity defined by the inner surface of the outer shell. A method of manufacturing a safety helmet is also disclosed.