Floating C-Profile Rail for Solar Collector Tube Stress Relief
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Solution Overview
Problem
The existing C-profile rail design for stabilizing meandering solar collector register tubes lacks sufficient stability and fails to effectively compensate for thermal stresses, making assembly and operation challenging.
Innovation Solution
A 'floating' C-rail design is introduced, allowing relative displacement between the register tube and the rail to mitigate thermal and mechanical stresses, achieved through strategically placed thickenings or recesses that secure the tube while enabling mobility, ensuring the register tube cannot detach perpendicular to the base and allowing movement along the rail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the register tube is rigidly fixed in the C-rail to increase stability, then the structural rigidity is improved, but thermal stresses cannot be compensated and the assembly becomes difficult
Solution Approach 1:
The C-rail design transitions from a rigid fixed connection to a dynamic floating bearing system. The register tube is guided in the C-rails such that it and the C-rail allow relative displacement to one another, enabling the structure to adapt to thermal expansion and contraction while maintaining stability.
Solution Approach 2:
The distance between the legs of the C-rail is varied along its length, with certain points designed to have a smaller distance to secure the register tube against detaching, while other areas have a larger distance to allow mobility. This parameter variation enables both stabilization and thermal stress compensation.
2Stability of the object's composition
If the register tube is guided in C-rails to increase rigidity, then the structural stability is improved, but thermal stresses are not sufficiently compensated
Solution Approach 1:
The floating bearing design allows the register tube to move dynamically within the C-rail constraints, providing both structural stability through guidance and thermal stress compensation through permitted displacement. The register tube can expand and contract freely along the longitudinal direction while being constrained perpendicular to the base.
Solution Approach 2:
The C-rail is segmented into different functional zones: areas with reduced leg distance for securing the register tube against detachment, and areas with normal or increased leg distance for allowing mobility and stress relief. This segmentation enables simultaneous achievement of stability and thermal compensation.
3Reliability
If thickenings are added to the C-rail to prevent detachment, then the security against detachment is improved, but the complexity of the rail structure increases
Solution Approach 1:
The C-rail features local thickenings at specific positions rather than uniform reinforcement throughout. These thickenings are strategically placed where the register tube requires securing against detachment, while other areas maintain the original simple C-profile geometry for ease of manufacturing and movement.
Solution Approach 2:
Instead of reinforcing the entire C-rail structure, only partial sections are thickened to provide the necessary detachment prevention. This partial action approach achieves the security requirement with minimal additional complexity and manufacturing effort.
Data Source
Figure 1~3
AI summary
The rail has legs (S1,S2) extending from a base (B) at a distance (A) to form a C-shaped cross-sectional profile. A discrete thickening portion (V) is provided in the leg (S1), so that distance between the legs is reduced. The thickening portion inner side is secured at the leg. The thickening portion is in the form of narrow parallelepiped. An independent claim is included for solar heat collector.