SOFC Insulation Box Press-Fit Assembly
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Solution Overview
Problem
Existing SOFC fuel cell system insulation devices face challenges with gap formation due to shrinkage of insulation materials, leading to reduced insulating properties and thermal bridges.
Innovation Solution
The inner box components are designed with an oversize press fit, ensuring an interference fit when assembled, and the outer box compresses the inner box from all sides to prevent gap formation, using materials like microporous insulation and a reinforced hollow structure for the outer box to maintain thermal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional insulation devices are used, then assembly is simple, but gaps form due to shrinkage leading to thermal bridges
Solution Approach 1:
The inner box components are pre-designed with oversized dimensions to account for future shrinkage. The base, cover, and side plates are manufactured larger than the final required dimensions, creating an interference fit that compensates for material shrinkage during operation, thereby preventing gap formation before it occurs.
Solution Approach 2:
The dimensions of the inner box components are intentionally changed to be oversized. By increasing the initial dimensions of the base, cover, and side plates beyond the maximum possible assembled dimensions, the design creates a press fit condition that maintains thermal integrity despite material shrinkage.
2Reliability
If insulation material is used, then thermal insulation is provided, but shrinkage occurs leading to gap formation
Solution Approach 1:
The design applies preliminary anti-action by creating an interference fit that counteracts the anticipated shrinkage force. The oversized components generate compressive stress that opposes the shrinkage tendency of the insulation material, preventing gap formation at the joints between base, cover, and side plates.
Solution Approach 2:
The invention accounts for thermal effects by designing components that accommodate shrinkage. The oversized dimensions allow the insulation material to shrink without creating gaps, as the initial excess material compensates for thermal dimension changes during operation.
3Reliability
If components are joined with gaps, then assembly is easier, but thermal bridges form reducing insulation efficiency
Solution Approach 1:
The components are pre-designed with oversized dimensions that automatically create a press fit during assembly. This preliminary design consideration ensures that no gaps exist at the joints between base, cover, and side plates, eliminating thermal bridges before the device is put into 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
This solution effectively prevents the formation of thermal bridges and maintains insulating efficiency even after initial material shrinkage, ensuring reliable thermal insulation and easy assembly/disassembly of the SOFC fuel cell system components.
Implementation Method 1
the outer box abuts and compresses the bottom, top, and side panels of the inner box
Implementation Method 2
The bottom and/or the top and/or the side panels can be made of a microporous insulating material
Data Source
Figure 1
AI summary
The invention relates to an apparatus (10) for accommodating at least one component of an SOFC fuel cell system, comprising a thermally insulating inner box (12) and an outer box (14) which surrounds the inner box (12), wherein the inner box (12) comprises a base (16), a cover (18) and side panels (20, 22, 24, 26), wherein the outer box (14) bears against the base (16), the cover (18), and the side panels (20, 22, 24, 26) of the inner box (12) and presses them together, and wherein the at least one component can be arranged in the interior of the inner box (12). According to the invention, provision is made for the base (16), the cover (18) and the side panels (20, 22, 24, 26) to be at least partly over-dimensioned, so that the inner box (12) can be assembled with a press-fit. The present invention further relates to a method for producing an apparatus of this kind.