Nested U-Shaped Beam Clean Room Light Fixture
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Solution Overview
Problem
Clean rooms face challenges in maintaining a contamination-free environment while supporting structural integrity and allowing for the servicing of light fixtures without compromising the barrier against air, gas, liquids, or biological materials.
Innovation Solution
A structural light fixture comprising nested, unperforated U-shaped beams made of aluminum, which serves as both a light source and a structural beam, reinforcing the ceiling and maintaining a fluid-tight seal, allowing for servicing from within the clean room without compromising the seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the ceiling is made thinner to reduce weight and cost, then the weight and cost decrease, but the structural strength and stiffness are reduced
Solution Approach 1:
The ceiling utilizes composite construction with walls and ceiling composed of opposing steel panels bonded to an aluminum honeycomb core. This composite structure provides high strength-to-weight ratio, maintaining structural integrity while reducing overall weight compared to solid metal panels of equivalent thickness.
Solution Approach 2:
The structural light fixture contains nested U-shaped beams where an inner U-shaped beam is positioned within the cavity formed by an outer U-shaped beam. This nesting arrangement maximizes structural stiffness and moment of inertia within the limited ceiling thickness, enhancing strength without increasing weight.
2Ease of manufacture
If the ceiling panels are made thinner for reduced weight and cost, then weight and cost decrease, but the structural requirements may not be met
Solution Approach 1:
The use of composite construction with steel panels bonded to aluminum honeycomb core provides optimal strength-to-cost ratio. The thin composite panels meet structural requirements while minimizing material usage and manufacturing cost compared to thicker solid panels.
Solution Approach 2:
The nested U-shaped beams within the light fixture create a reinforced structural element that compensates for the thinness of the ceiling panels. This nested configuration provides the necessary structural support at minimal additional cost.
3Reliability
If the outer U-shaped beam is closed and unperforated to maintain fluid-tight seal, then contamination prevention is improved, but access for servicing becomes difficult
Solution Approach 1:
The light fixture is segmented into separable components including the outer U-shaped beam, inner U-shaped beam, lamp assembly, and power supply. This segmentation allows the inner beam and lighting components to be independently accessed and serviced while maintaining the sealed integrity of the outer beam structure.
Solution Approach 2:
The inner U-shaped beam acts as an intermediary structure that provides access to the lamp and power supply components. By nesting the serviceable components within the inner beam, the design maintains the fluid-tight seal of the outer beam while enabling convenient servicing from the clean room side.
4Strength
If nested U-shaped beams are used to increase structural strength, then ceiling strength and stiffness improve, but device complexity increases
Solution Approach 1:
The nested U-shaped beam structure serves multiple functions simultaneously: it provides structural strength and stiffness to the ceiling, acts as a fluid-tight barrier, and creates accessible cavities for housing and servicing lighting components. This multi-functionality reduces the need for separate structural and functional elements.
Solution Approach 2:
The nested configuration of U-shaped beams creates a space-efficient structural solution where the inner beam is utilized both for structural reinforcement and for housing the lamp and power supply. This eliminates the need for separate mounting structures and reduces overall device complexity.
Data Source
AI summary
A structural light fixture for the ceiling of clean room, such as a clean room for pharmaceutical or electronic research or production, includes an outer U-shaped beam and an inner U-shaped beam. The inner U-shaped beam nests within the outer U-shaped beam. The inner and outer U-shaped beams are mutually reinforcing so that the combination of the two U-shaped beams is stronger and stiffer than either U-shaped beam alone. The top side of the outer U-shaped beam is exposed to the outside of the clean room and includes no perforations so that the outer U-shaped beam is a barrier to gas, particulates, microorganisms or disinfectants that otherwise would pass through the clean room ceiling. The removable inner U-shaped beam includes a lamp and power supply, allowing maintenance of the structural light fixture from the interior of the clean room without interrupting the barrier to contamination created by the structural light fixture.