Cellular Multilayer Insulation for Cryogenic Vacuum Stability
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Solution Overview
Problem
Conventional insulation materials fail to provide adequate thermal performance in both atmospheric and space conditions, leading to issues such as high weight-to-thermal performance ratios, structural instability, and increased liftoff mass, particularly when used with cryogenic propellants like liquid hydrogen.
Innovation Solution
The development of Cellular Load-Responsive Multilayer Insulation (CLRMLI) featuring hermetically sealed cells with multiple layers of radiant barrier material separated by spacers, which can be evacuated to create a vacuum, reducing heat conduction and convection, and maintaining structural integrity under external pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional insulation materials are used, then thermal performance is provided, but weight-to-thermal performance ratio increases and structural instability occurs
Solution Approach 1:
The insulation structure is divided into multiple hermetically sealed cells, each containing a specific volume of vacuum or gas. This segmentation allows the structure to maintain structural integrity while reducing overall weight, as each cell independently provides thermal insulation without requiring heavy continuous material support.
Solution Approach 2:
The patent employs vacuum or inert gas environments within the hermetically sealed cells to provide thermal insulation. By replacing conventional solid insulation materials with vacuum or inert gas, the system achieves superior thermal performance with significantly reduced weight, while the hermetic sealing maintains structural stability.
2Reliability
If conventional insulation materials are used, then thermal insulation is provided, but liftoff mass increases
Solution Approach 1:
The patent employs vacuum or inert gas environments within the hermetically sealed cells to provide thermal insulation. By replacing conventional solid insulation materials with vacuum or inert gas, the system achieves superior thermal performance with significantly reduced weight, while the hermetic sealing maintains structural stability.
Solution Approach 2:
The patent changes the physical state of the insulation medium from solid conventional materials to vacuum or gas phase. This parameter change dramatically reduces the density and weight of the insulation system while maintaining or improving thermal insulation performance, directly reducing liftoff mass.
3Reliability
If hermetically sealed cells are evacuated to create vacuum, then heat conduction and convection are reduced, but structural integrity under external pressure must be maintained
Solution Approach 1:
The insulation structure is divided into multiple hermetically sealed cells, each containing a specific volume of vacuum or gas. This segmentation allows the structure to maintain structural integrity while reducing overall weight, as each cell independently provides thermal insulation without requiring heavy continuous material support.
Solution Approach 2:
The hermetic sealing is designed to withstand external atmospheric pressure before vacuum evacuation. The cell walls and sealing structures are pre-engineered with adequate strength and stiffness to resist collapse under pressure differential, providing structural cushioning that maintains integrity throughout operation.
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
CLRMLI significantly outperforms conventional insulation materials by providing superior thermal performance while minimizing weight and structural issues, achieving low heat flux and reduced boil-off, making it suitable for modern space flight missions.
Implementation Method 1
which can be evacuated to create a vacuum, reducing heat conduction and convection
Implementation Method 2
Gas selected to at least one of condense and freeze in response to cryogenic cooling of a structure to which the insulation panel is coupled
Implementation Method 3
Gas selected to at least one of condense and freeze in response to cryogenic cooling of a structure to which the insulation panel is coupled
Implementation Method 4
cryogenic cooling of a structure to which the insulation panel is coupled
Data Source
AI summary
An insulation panel includes a face sheet hermetically coupled to a plurality of structural walls to define a plurality of cell bodies, with each cell body positioned contiguously with an adjacent cell body. An insulation structure is disposed within each cell body and further includes a first radiant barrier layer, a second radiant barrier layer, and a spacer disposed between the first radiant barrier layer and the second radiant barrier layer. Sealed cells formed by completing the cell bodies may contain a gas that condenses or freezes in response to cryogenic cooling of a structure to which the insulation panel is coupled. Load-responsive spacers may also be disposed between the insulation structure and the face sheet to support the face sheet while in atmospheric conditions and to disengage from the face sheet in low pressure environments, such as space.