Multilayer Insulation with Segmented Polymer Posts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current multilayer insulation technologies face challenges in providing high-performance thermal insulation for cryogenic systems, particularly in maintaining performance under varying gravity conditions and requiring a lightweight structure that can withstand atmospheric pressure without significant mass increase.
Innovation Solution
A high-performance integrated thermal insulation structure featuring metalized polymer sheets separated by a rigid polymer structure with staggered support posts and optional beams, designed to minimize thermal conduction and accommodate compression effects, allowing for predictable performance across different gravitational conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vacuum shell is used to protect the insulation within the atmosphere, then the insulation performance is maintained, but the mass increases significantly (on the order of 10 kg/m^2)
Solution Approach 1:
The patent combines MLI layers with a foam core to create a composite insulation structure. The foam provides structural rigidity and atmospheric pressure resistance, eliminating the need for a separate heavy vacuum shell, while the MLI layers provide thermal insulation. This composite approach achieves both mechanical strength and thermal performance without the 10 kg/m^2 mass penalty of conventional vacuum shells.
Solution Approach 2:
The foam core serves multiple functions simultaneously: it provides structural support to resist atmospheric pressure, maintains the separation between MLI layers, and contributes to thermal insulation. This multi-functionality eliminates the need for separate components (vacuum shell, support structure, insulation layers) that would otherwise be required, significantly reducing overall mass.
2Ease of manufacture
If fabric net is used to separate polymer sheets, then the structure is flexible and easy to manufacture, but the thermal contact conductance is high and unpredictable
Solution Approach 1:
The patent uses foam as a porous separator between MLI layers instead of fabric net. The foam's cellular structure provides thermal resistance while maintaining mechanical separation and allowing for predictable thermal conductance characteristics. The porous structure fills gaps and provides consistent spacing without the high thermal contact conductance of fabric nets.
3Strength
If continuous post elements are used in support posts, then the structural strength is maximized, but the thermal conductivity increases
Solution Approach 1:
The patent segments the support posts into discrete post elements rather than using continuous structures. This segmentation interrupts thermal conduction paths through the support posts while maintaining sufficient mechanical strength to hold layers apart. The broken thermal paths reduce parasitic heat leakage without compromising the structural function of supporting the MLI layers.
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 lightweight, high-performance thermal insulation system that maintains performance under varying gravity conditions, reduces thermal conductivity, and facilitates easier fabrication and handling, while being significantly lighter than conventional systems.
Implementation Method 1
layers of metalized polymer sheets
Implementation Method 2
separated by a rigid polymer structure that includes a plurality of support posts... optimized to minimize the thermal conduction
Data Source
AI summary
A multilayer insulation with an array of rigid posts is provided. In particular, the posts are comprised of multiple post elements that are interconnected to radiation shields or sheets comprising the layers of the integrated multi-layer insulation structure. The post elements maintain spacing between adjacent sheets, thus maintaining a volume between the sheets. The post elements within a post can be attached to one another to form an integrated post structure. Moreover, neighboring posts can be interconnected to one another by beams. The post elements can also be configured so that, when the IMLI structure is not subjected to atmospheric pressure, the elements within a post are separated from one another to form gaps, thereby reducing heat transfer between layers.