Clean Room Light Fixture Sealing and Heat Management
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Solution Overview
Problem
Light fixtures for controlled environments, such as clean rooms and surgical suites, face challenges in providing a hermetic seal and meeting stringent standards for particulate and fluid imperviousness while allowing for easy installation and maintenance, with existing solutions often requiring complex mounting and potential corrosion issues.
Innovation Solution
The design features a light fixture with a single gasket for sealing to the ceiling, an aluminum housing acting as a heat sink for LEDs, and a lens frame made from corrosion-resistant stainless steel, allowing for installation from below without removing the lens frame, and a power supply either within or outside the enclosure with a quick-connect electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hermetic seal is provided using traditional sealing methods, then sealing reliability is improved, but device complexity and installation difficulty increase
Solution Approach 1:
The patent combines multiple sealing functions into a single gasket that simultaneously seals between the housing and ceiling, and between the lens frame and ceiling. This single gasket integrates what would traditionally require multiple separate sealing components, reducing device complexity while maintaining hermetic sealing reliability for controlled environments.
2Shape
If the light fixture is designed for recessed installation in ceiling, then aesthetic appearance and space utilization are improved, but installation difficulty and maintenance complexity increase
Solution Approach 1:
The light fixture is segmented into distinct modular components including the housing, lens frame, gasket, and mounting hardware. This segmentation allows the fixture to be installed as a complete recessed unit while enabling easy access to individual components for maintenance without requiring complete disassembly, thus maintaining aesthetic recessed installation while improving ease of operation.
Solution Approach 2:
The lens frame is designed to be removable from the housing, allowing the light engine and internal components to be accessed and replaced without removing the entire fixture from the recessed ceiling installation. This extraction capability maintains the aesthetic recessed configuration while significantly easing maintenance operations.
3Temperature
If LED light source is mounted directly to aluminum housing, then heat dissipation efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The aluminum housing serves multiple functions simultaneously: it provides structural support for the LED light source, acts as a heat sink for thermal management, and serves as the mounting surface for the LED assembly. This multi-functionality integrates thermal management and structural support into a single component, improving heat dissipation while reducing the need for separate precision-machined mounting fixtures.
4Reliability
If lens frame is made from stainless steel, then corrosion resistance is improved, but manufacturing cost increases
Solution Approach 1:
Stainless steel material is applied specifically to the lens frame, which is the component most exposed to controlled environment conditions and most susceptible to corrosion. Other internal components can use less expensive materials, thus achieving maximum corrosion resistance where needed while controlling overall manufacturing costs through selective material application.
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 solution provides a reliable, easy-to-install, and maintainable light fixture that meets stringent sealing and corrosion resistance requirements, ensuring a hermetic seal and efficient heat management while accommodating various ceiling types and applications.
Implementation Method 1
The housing functions as the heat sink for the LED light source with the heat being transferred by conduction because of the direct connection between the two elements
Implementation Method 2
The light fixture forms a seal between the controlled environment and the plenum environment
Data Source
AI summary
Controlled environment light fixture configurations include an LED light source. The light fixtures can be installed and removed from below the ceiling. The light fixture can be installed and removed without opening the lens frame of the light fixture. The light fixture includes a sealed housing and seals to the ceiling when installed. The light fixtures are provided in exterior dimension sizes that allow the fixtures to be installed in a variety of controlled environment ceilings in recessed configurations. The lower surface exposed to the controlled environment is free of welds and grinds in order to provide a corrosion resistant surface.