Sealed LED Lighting Device Cooling via Gas Flow
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Solution Overview
Problem
Existing lighting devices with air-circulating cooling fans suffer from contamination by dust and particles, which reduces cooling performance and lifespan over time.
Innovation Solution
A sealed transparent casing houses the light source and ventilation unit, generating a gas flow to transfer heat to the casing's inner surface for cooling, while keeping the ventilation unit contamination-free and decoupling it from the casing to reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling fan is used to circulate air for cooling LEDs, then cooling performance is improved, but dust and contaminations from outside are transferred to the cooling fan and LEDs, reducing cooling performance and lifetime over time
Solution Approach 1:
The lighting device is divided into two separate zones: a sealed first region containing the LEDs and control electronics, and an external second region for the cooling fan. This segmentation prevents dust and contaminants from reaching the sensitive internal components while maintaining effective cooling through the sealed transparent casing.
Solution Approach 2:
The sealed transparent casing acts as an intermediary barrier between the internal LED region and the external cooling fan. It allows thermal energy to pass through (for cooling) while blocking dust and contaminations, thus mediating between the need for cooling and the need for protection.
2Strength
If the ventilation unit is mechanically coupled to the casing, then structural support is provided, but vibrations are transferred to the casing, increasing structure-born noise
Solution Approach 1:
A damping element is introduced as an intermediary between the cooling fan and the casing. This damping element absorbs and reduces vibrations, preventing them from being transferred to the casing and reducing structure-born noise while still providing mechanical support.
3Reliability
If the casing is sealed to prevent contamination, then cooling performance and lifetime are improved, but heat dissipation becomes more challenging
Solution Approach 1:
The sealed transparent casing allows thermal energy to pass through while maintaining the seal. The casing material and design enable heat transfer from the internal region to the external environment, facilitating heat dissipation without compromising the sealed protection against dust and contaminants.
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 approach enhances cooling performance and extends the device's lifespan by preventing contamination and minimizing noise, while allowing for improved thermal management and additional functionalities like sensors and optical mixing within the compact design.
Implementation Method 1
the ventilation unit is adapted for generating a gas flow for transporting heat generated by the light source to an inner surface of the casing
Implementation Method 2
the ventilation unit is adapted for generating a gas flow for transporting heat generated by the light source from at least one of the light source and the heat sink to the inner surface of the casing
Data Source
AI summary
The invention relates to a light device comprising a light source (2), a ventilation unit (3) and a sealed transparent casing (4) sealing the inside (5) of the casing from the outside of the casing (4). The light source (2) and the ventilation unit (3) are located within the casing (4) and the ventilation unit (3) is adapted for generating a gas flow (6, 7) for transporting heat generated by the light source (2) to an inner surface (8) of the casing (4).